Probleme de lancement de Minecraft

[kirbystars]

Bonsoir ! , mon minecraft c'est encore mit tout a coup a ne pas vouloir ce lancer ( j'utilise l'ancien launcher). Pour detailler , quand je clique sur "play" et bien au lieu de ce lancer et bien le jeu me laisse un message :

 

[23moon23]

J'ai le même message d'erreur mais je n'ai pas le texte en rouge qui apparaît. Il y a seulement:"Erreur : impossible de trouver ou charger la classe principale net.minecraft.client.main.Main".
J'ai cherché sur tous les forum et essayé toutes les solutions proposé(réinstallation de java et de minecraft,mise à jour driver) mais rien ne marche.
Je précise que le jeu marchait très bien le jour avant et que je n'ai installé aucun logiciel supplémentaire entre temps. Par contre,ceci a peut-être rien à voir mais j'ai essayé de créer une version portable de minecraft sur usb,j'ai donc lancé le dossier "start.bat" comme demandé et depuis impossible de lancer le jeu.
Je suis sous vista,j'essayé différente version de minecraft: 1.12,1.11 avec ou sans forge.

Le launcher log:

[00:33:57 INFO]: Minecraft Launcher 1.6.82 (through bootstrap 100) started on windows...
[00:33:57 INFO]: Current time is Oct 26, 2017 12:33:57 AM
[00:33:57 INFO]: System.getProperty('os.name') == 'Windows Vista'
[00:33:57 INFO]: System.getProperty('os.version') == '6.0'
[00:33:57 INFO]: System.getProperty('os.arch') == 'x86'
[00:33:57 INFO]: System.getProperty('java.version') == '1.8.0_25'
[00:33:57 INFO]: System.getProperty('java.vendor') == 'Oracle Corporation'
[00:33:57 INFO]: System.getProperty('sun.arch.data.model') == '32'
[00:33:57 INFO]: proxy == DIRECT
[00:33:58 INFO]: JFX is already initialized
[00:33:58 INFO]: Refreshing local version list...
[00:33:58 INFO]: Refreshing remote version list...
[00:33:59 INFO]: Refresh complete.
[00:33:59 INFO]: Loaded 1 profile(s); selected 'Minework23'
[00:33:59 INFO]: Refreshing auth...
[00:33:59 INFO]: Logging in with access token
[00:34:05 INFO]: Getting syncinfo for selected version
[00:34:05 INFO]: Queueing library & version downloads
[00:34:06 INFO]: Download job 'Version & Libraries' started (16 threads, 35 files)
[00:34:06 INFO]: Attempting to download C:\Users\Moon\AppData\Roaming\.minecraft\libraries\org\apache\logging\log4j\log4j-core\2.8.1\log4j-core-2.8.1.jar for job 'Version & Libraries'... (try 0)
[00:34:06 INFO]: Attempting to download C:\Users\Moon\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl\2.9.4-nightly-20150209\lwjgl-2.9.4-nightly-20150209.jar for job 'Version & Libraries'... (try 0)
[00:34:06 INFO]: Attempting to download C:\Users\Moon\AppData\Roaming\.minecraft\libraries\io\netty\netty-all\4.1.9.Final\netty-all-4.1.9.Final.jar for job 'Version & Libraries'... (try 0)
[00:34:06 INFO]: Attempting to download C:\Users\Moon\AppData\Roaming\.minecraft\libraries\com\mojang\authlib\1.5.25\authlib-1.5.25.jar for job 'Version & Libraries'... (try 0)
[00:34:06 INFO]: Attempting to download C:\Users\Moon\AppData\Roaming\.minecraft\libraries\com\paulscode\codecjorbis\20101023\codecjorbis-20101023.jar for job 'Version & Libraries'... (try 0)
[00:34:06 INFO]: Attempting to download C:\Users\Moon\AppData\Roaming\.minecraft\libraries\com\paulscode\libraryjavasound\20101123\libraryjavasound-20101123.jar for job 'Version & Libraries'... (try 0)
[00:34:06 INFO]: Attempting to download C:\Users\Moon\AppData\Roaming\.minecraft\libraries\com\mojang\text2speech\1.10.3\text2speech-1.10.3-natives-windows.jar for job 'Version & Libraries'... (try 0)
[00:34:06 INFO]: Attempting to download C:\Users\Moon\AppData\Roaming\.minecraft\libraries\com\google\code\gson\gson\2.8.0\gson-2.8.0.jar for job 'Version & Libraries'... (try 0)
[00:34:06 INFO]: Attempting to download C:\Users\Moon\AppData\Roaming\.minecraft\libraries\com\google\guava\guava\21.0\guava-21.0.jar for job 'Version & Libraries'... (try 0)
[00:34:06 INFO]: Attempting to download C:\Users\Moon\AppData\Roaming\.minecraft\libraries\org\apache\commons\commons-lang3\3.5\commons-lang3-3.5.jar for job 'Version & Libraries'... (try 0)
[00:34:06 INFO]: Attempting to download C:\Users\Moon\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl_util\2.9.4-nightly-20150209\lwjgl_util-2.9.4-nightly-20150209.jar for job 'Version & Libraries'... (try 0)
[00:34:06 INFO]: Attempting to download C:\Users\Moon\AppData\Roaming\.minecraft\libraries\net\java\jinput\jinput-platform\2.0.5\jinput-platform-2.0.5-natives-windows.jar for job 'Version & Libraries'... (try 0)
[00:34:06 INFO]: Attempting to download C:\Users\Moon\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl-platform\2.9.4-nightly-20150209\lwjgl-platform-2.9.4-nightly-20150209-natives-windows.jar for job 'Version & Libraries'... (try 0)
[00:34:06 INFO]: Attempting to download C:\Users\Moon\AppData\Roaming\.minecraft\libraries\org\apache\httpcomponents\httpcore\4.3.2\httpcore-4.3.2.jar for job 'Version & Libraries'... (try 0)
[00:34:06 INFO]: Attempting to download C:\Users\Moon\AppData\Roaming\.minecraft\libraries\com\paulscode\codecwav\20101023\codecwav-20101023.jar for job 'Version & Libraries'... (try 0)
[00:34:06 INFO]: Attempting to download C:\Users\Moon\AppData\Roaming\.minecraft\libraries\org\apache\httpcomponents\httpclient\4.3.3\httpclient-4.3.3.jar for job 'Version & Libraries'... (try 0)
[00:34:08 INFO]: Download job 'Resources' skipped as there are no files to download
[00:34:08 INFO]: Job 'Resources' finished successfully (took 0:00:00.000)
[00:34:08 INFO]: Finished downloading C:\Users\Moon\AppData\Roaming\.minecraft\libraries\io\netty\netty-all\4.1.9.Final\netty-all-4.1.9.Final.jar for job 'Version & Libraries': Local file matches hash, using that
[00:34:08 INFO]: Finished downloading C:\Users\Moon\AppData\Roaming\.minecraft\libraries\com\google\guava\guava\21.0\guava-21.0.jar for job 'Version & Libraries': Local file matches hash, using that
[00:34:08 INFO]: Attempting to download C:\Users\Moon\AppData\Roaming\.minecraft\libraries\net\java\jutils\jutils\1.0.0\jutils-1.0.0.jar for job 'Version & Libraries'... (try 0)
[00:34:08 INFO]: Finished downloading C:\Users\Moon\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl-platform\2.9.4-nightly-20150209\lwjgl-platform-2.9.4-nightly-20150209-natives-windows.jar for job 'Version & Libraries': Local file matches hash, using that
[00:34:08 INFO]: Attempting to download C:\Users\Moon\AppData\Roaming\.minecraft\libraries\com\paulscode\soundsystem\20120107\soundsystem-20120107.jar for job 'Version & Libraries'... (try 0)
[00:34:08 INFO]: Finished downloading C:\Users\Moon\AppData\Roaming\.minecraft\libraries\org\apache\httpcomponents\httpclient\4.3.3\httpclient-4.3.3.jar for job 'Version & Libraries': Local file matches hash, using that
[00:34:08 INFO]: Attempting to download C:\Users\Moon\AppData\Roaming\.minecraft\libraries\org\apache\logging\log4j\log4j-api\2.8.1\log4j-api-2.8.1.jar for job 'Version & Libraries'... (try 0)
[00:34:08 INFO]: Attempting to download C:\Users\Moon\AppData\Roaming\.minecraft\libraries\net\sf\jopt-simple\jopt-simple\5.0.3\jopt-simple-5.0.3.jar for job 'Version & Libraries'... (try 0)
[00:34:08 INFO]: Finished downloading C:\Users\Moon\AppData\Roaming\.minecraft\libraries\net\java\jutils\jutils\1.0.0\jutils-1.0.0.jar for job 'Version & Libraries': Local file matches hash, using that
[00:34:08 INFO]: Attempting to download C:\Users\Moon\AppData\Roaming\.minecraft\libraries\oshi-project\oshi-core\1.1\oshi-core-1.1.jar for job 'Version & Libraries'... (try 0)
[00:34:08 INFO]: Finished downloading C:\Users\Moon\AppData\Roaming\.minecraft\libraries\oshi-project\oshi-core\1.1\oshi-core-1.1.jar for job 'Version & Libraries': Local file matches hash, using that
[00:34:08 INFO]: Attempting to download C:\Users\Moon\AppData\Roaming\.minecraft\libraries\net\java\jinput\jinput\2.0.5\jinput-2.0.5.jar for job 'Version & Libraries'... (try 0)
[00:34:08 INFO]: Finished downloading C:\Users\Moon\AppData\Roaming\.minecraft\libraries\com\paulscode\soundsystem\20120107\soundsystem-20120107.jar for job 'Version & Libraries': Local file matches hash, using that
[00:34:08 INFO]: Attempting to download C:\Users\Moon\AppData\Roaming\.minecraft\libraries\com\mojang\realms\1.10.17\realms-1.10.17.jar for job 'Version & Libraries'... (try 0)
[00:34:08 INFO]: Finished downloading C:\Users\Moon\AppData\Roaming\.minecraft\libraries\org\apache\logging\log4j\log4j-api\2.8.1\log4j-api-2.8.1.jar for job 'Version & Libraries': Local file matches hash, using that
[00:34:08 INFO]: Attempting to download C:\Users\Moon\AppData\Roaming\.minecraft\libraries\commons-codec\commons-codec\1.10\commons-codec-1.10.jar for job 'Version & Libraries'... (try 0)
[00:34:08 INFO]: Finished downloading C:\Users\Moon\AppData\Roaming\.minecraft\libraries\net\java\jinput\jinput\2.0.5\jinput-2.0.5.jar for job 'Version & Libraries': Local file matches hash, using that
[00:34:08 INFO]: Attempting to download C:\Users\Moon\AppData\Roaming\.minecraft\libraries\it\unimi\dsi\fastutil\7.1.0\fastutil-7.1.0.jar for job 'Version & Libraries'... (try 0)
[00:34:08 INFO]: Finished downloading C:\Users\Moon\AppData\Roaming\.minecraft\libraries\commons-codec\commons-codec\1.10\commons-codec-1.10.jar for job 'Version & Libraries': Local file matches hash, using that
[00:34:08 INFO]: Attempting to download C:\Users\Moon\AppData\Roaming\.minecraft\libraries\org\apache\commons\commons-compress\1.8.1\commons-compress-1.8.1.jar for job 'Version & Libraries'... (try 0)
[00:34:08 INFO]: Finished downloading C:\Users\Moon\AppData\Roaming\.minecraft\libraries\net\sf\jopt-simple\jopt-simple\5.0.3\jopt-simple-5.0.3.jar for job 'Version & Libraries': Local file matches hash, using that
[00:34:08 INFO]: Attempting to download C:\Users\Moon\AppData\Roaming\.minecraft\libraries\com\paulscode\librarylwjglopenal\20100824\librarylwjglopenal-20100824.jar for job 'Version & Libraries'... (try 0)
[00:34:08 INFO]: Finished downloading C:\Users\Moon\AppData\Roaming\.minecraft\libraries\com\paulscode\librarylwjglopenal\20100824\librarylwjglopenal-20100824.jar for job 'Version & Libraries': Local file matches hash, using that
[00:34:08 INFO]: Attempting to download C:\Users\Moon\AppData\Roaming\.minecraft\libraries\com\mojang\patchy\1.1\patchy-1.1.jar for job 'Version & Libraries'... (try 0)
[00:34:08 INFO]: Finished downloading C:\Users\Moon\AppData\Roaming\.minecraft\libraries\org\apache\commons\commons-compress\1.8.1\commons-compress-1.8.1.jar for job 'Version & Libraries': Local file matches hash, using that
[00:34:08 INFO]: Attempting to download C:\Users\Moon\AppData\Roaming\.minecraft\libraries\net\java\dev\jna\jna\4.4.0\jna-4.4.0.jar for job 'Version & Libraries'... (try 0)
[00:34:08 INFO]: Finished downloading C:\Users\Moon\AppData\Roaming\.minecraft\libraries\com\mojang\patchy\1.1\patchy-1.1.jar for job 'Version & Libraries': Local file matches hash, using that
[00:34:08 INFO]: Attempting to download C:\Users\Moon\AppData\Roaming\.minecraft\libraries\commons-logging\commons-logging\1.1.3\commons-logging-1.1.3.jar for job 'Version & Libraries'... (try 0)
[00:34:08 INFO]: Finished downloading C:\Users\Moon\AppData\Roaming\.minecraft\libraries\net\java\dev\jna\jna\4.4.0\jna-4.4.0.jar for job 'Version & Libraries': Local file matches hash, using that
[00:34:08 INFO]: Attempting to download C:\Users\Moon\AppData\Roaming\.minecraft\libraries\com\mojang\text2speech\1.10.3\text2speech-1.10.3.jar for job 'Version & Libraries'... (try 0)
[00:34:08 INFO]: Finished downloading C:\Users\Moon\AppData\Roaming\.minecraft\libraries\com\mojang\text2speech\1.10.3\text2speech-1.10.3.jar for job 'Version & Libraries': Local file matches hash, using that
[00:34:08 INFO]: Attempting to download C:\Users\Moon\AppData\Roaming\.minecraft\libraries\com\ibm\icu\icu4j-core-mojang\51.2\icu4j-core-mojang-51.2.jar for job 'Version & Libraries'... (try 0)
[00:34:08 INFO]: Finished downloading C:\Users\Moon\AppData\Roaming\.minecraft\libraries\org\apache\httpcomponents\httpcore\4.3.2\httpcore-4.3.2.jar for job 'Version & Libraries': Local file matches hash, using that
[00:34:08 INFO]: Attempting to download C:\Users\Moon\AppData\Roaming\.minecraft\libraries\net\java\dev\jna\platform\3.4.0\platform-3.4.0.jar for job 'Version & Libraries'... (try 0)
[00:34:08 INFO]: Finished downloading C:\Users\Moon\AppData\Roaming\.minecraft\libraries\org\apache\commons\commons-lang3\3.5\commons-lang3-3.5.jar for job 'Version & Libraries': Local file matches hash, using that
[00:34:08 INFO]: Attempting to download C:\Users\Moon\AppData\Roaming\.minecraft\libraries\commons-io\commons-io\2.5\commons-io-2.5.jar for job 'Version & Libraries'... (try 0)
[00:34:08 INFO]: Finished downloading C:\Users\Moon\AppData\Roaming\.minecraft\libraries\commons-logging\commons-logging\1.1.3\commons-logging-1.1.3.jar for job 'Version & Libraries': Local file matches hash, using that
[00:34:08 INFO]: Attempting to download C:\Users\Moon\AppData\Roaming\.minecraft\versions\1.12.1\1.12.1.jar for job 'Version & Libraries'... (try 0)
[00:34:08 INFO]: Finished downloading C:\Users\Moon\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl_util\2.9.4-nightly-20150209\lwjgl_util-2.9.4-nightly-20150209.jar for job 'Version & Libraries': Local file matches hash, using that
[00:34:08 INFO]: Finished downloading C:\Users\Moon\AppData\Roaming\.minecraft\libraries\com\paulscode\codecwav\20101023\codecwav-20101023.jar for job 'Version & Libraries': Local file matches hash, using that
[00:34:08 INFO]: Finished downloading C:\Users\Moon\AppData\Roaming\.minecraft\libraries\commons-io\commons-io\2.5\commons-io-2.5.jar for job 'Version & Libraries': Local file matches hash, using that
[00:34:08 INFO]: Finished downloading C:\Users\Moon\AppData\Roaming\.minecraft\libraries\net\java\jinput\jinput-platform\2.0.5\jinput-platform-2.0.5-natives-windows.jar for job 'Version & Libraries': Local file matches hash, using that
[00:34:08 INFO]: Finished downloading C:\Users\Moon\AppData\Roaming\.minecraft\libraries\com\google\code\gson\gson\2.8.0\gson-2.8.0.jar for job 'Version & Libraries': Local file matches hash, using that
[00:34:08 INFO]: Finished downloading C:\Users\Moon\AppData\Roaming\.minecraft\libraries\com\paulscode\libraryjavasound\20101123\libraryjavasound-20101123.jar for job 'Version & Libraries': Local file matches hash, using that
[00:34:08 INFO]: Finished downloading C:\Users\Moon\AppData\Roaming\.minecraft\libraries\com\mojang\text2speech\1.10.3\text2speech-1.10.3-natives-windows.jar for job 'Version & Libraries': Local file matches hash, using that
[00:34:08 INFO]: Finished downloading C:\Users\Moon\AppData\Roaming\.minecraft\libraries\org\apache\logging\log4j\log4j-core\2.8.1\log4j-core-2.8.1.jar for job 'Version & Libraries': Local file matches hash, using that
[00:34:08 INFO]: Finished downloading C:\Users\Moon\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl\2.9.4-nightly-20150209\lwjgl-2.9.4-nightly-20150209.jar for job 'Version & Libraries': Local file matches hash, using that
[00:34:08 INFO]: Finished downloading C:\Users\Moon\AppData\Roaming\.minecraft\libraries\com\paulscode\codecjorbis\20101023\codecjorbis-20101023.jar for job 'Version & Libraries': Local file matches hash, using that
[00:34:08 INFO]: Finished downloading C:\Users\Moon\AppData\Roaming\.minecraft\libraries\com\mojang\authlib\1.5.25\authlib-1.5.25.jar for job 'Version & Libraries': Local file matches hash, using that
[00:34:08 INFO]: Finished downloading C:\Users\Moon\AppData\Roaming\.minecraft\libraries\com\ibm\icu\icu4j-core-mojang\51.2\icu4j-core-mojang-51.2.jar for job 'Version & Libraries': Local file matches hash, using that
[00:34:08 INFO]: Finished downloading C:\Users\Moon\AppData\Roaming\.minecraft\libraries\net\java\dev\jna\platform\3.4.0\platform-3.4.0.jar for job 'Version & Libraries': Local file matches hash, using that
[00:34:08 INFO]: Finished downloading C:\Users\Moon\AppData\Roaming\.minecraft\libraries\com\mojang\realms\1.10.17\realms-1.10.17.jar for job 'Version & Libraries': Local file matches hash, using that
[00:34:08 INFO]: Finished downloading C:\Users\Moon\AppData\Roaming\.minecraft\versions\1.12.1\1.12.1.jar for job 'Version & Libraries': Local file matches hash, using that
[00:34:08 INFO]: Finished downloading C:\Users\Moon\AppData\Roaming\.minecraft\libraries\it\unimi\dsi\fastutil\7.1.0\fastutil-7.1.0.jar for job 'Version & Libraries': Local file matches hash, using that
[00:34:08 INFO]: Job 'Version & Libraries' finished successfully (took 0:00:02.496)
[00:34:08 INFO]: Launching game
[00:34:08 INFO]: Unpacking natives to C:\Users\Moon\AppData\Roaming\.minecraft\versions\1.12.1\1.12.1-natives-4430157660610
[00:34:08 INFO]: Launching in C:\Users\Moon\AppData\Roaming\.minecraft
[00:34:09 INFO]: Half command: C:\Program Files\Minecraft\runtime\jre-x32\1.8.0_25\bin\javaw.exe -Xmx512M -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M net.minecraft.client.main.Main
[00:34:09 INFO]: Looking for orphaned versions to clean up...
[00:34:09 ERROR]: Game ended with bad state (exit code 1)
[00:34:09 INFO]: Ignoring visibility rule and showing launcher due to a game crash
[00:34:10 INFO]: Looking for old natives & assets to clean up...
[00:34:10 INFO]: Deleting C:\Users\Moon\AppData\Roaming\.minecraft\versions\1.12.1\1.12.1-natives-4430157660610