it is my problem:
Launcher 0.8.3 (Dev) (through bootstrap 0) started on windows...
System.getProperty('os.name') == 'Windows 7'
System.getProperty('os.version') == '6.1'
System.getProperty('os.arch') == 'x86'
System.getProperty('java.version') == '1.7.0_25'
System.getProperty('java.vendor') == 'Oracle Corporation'
Loaded 2 profile(s); selected '(Default)'
C:\Users\ANGI\AppData\Roaming\.minecraft\versions\1.6.1\1.6.1.json
C:\Users\ANGI\AppData\Roaming\.minecraft\versions\1.6.2\1.6.2.json
Delta time to compare resources: 419 ms
Download job 'Resources' skipped as there are no files to download
Job 'Resources' finished successfully
Trying to log in...
Logged in successfully
Getting syncinfo for selected version
Queueing library & version downloads
Download job 'Version & Libraries' started (8 threads, 1 files)
Finished downloading C:\Users\ANGI\AppData\Roaming\.minecraft\versions\1.6.2\1.6.2.jar for job 'Version & Libraries': Used own copy as it matched etag
Job 'Version & Libraries' finished successfully
Launching game
Unpacking natives to C:\Users\ANGI\AppData\Roaming\.minecraft\versions\1.6.2\1.6.2-natives-43934103004014
Launching in C:\Users\ANGI\AppData\Roaming\.minecraft
Running: "C:\Program Files (x86)\Java\jre7\bin\javaw.exe" -Xmx1G -Djava.library.path=C:\Users\ANGI\AppData\Roaming\.minecraft\versions\1.6.2\1.6.2-natives-43934103004014 -cp C:\Users\ANGI\AppData\Roaming\.minecraft\libraries\net\sf\jopt-simple\jopt-simple\4.5\jopt-simple-4.5.jar;C:\Users\ANGI\AppData\Roaming\.minecraft\libraries\com\paulscode\codecjorbis\20101023\codecjorbis-20101023.jar;C:\Users\ANGI\AppData\Roaming\.minecraft\libraries\com\paulscode\codecwav\20101023\codecwav-20101023.jar;C:\Users\ANGI\AppData\Roaming\.minecraft\libraries\com\paulscode\libraryjavasound\20101123\libraryjavasound-20101123.jar;C:\Users\ANGI\AppData\Roaming\.minecraft\libraries\com\paulscode\librarylwjglopenal\20100824\librarylwjglopenal-20100824.jar;C:\Users\ANGI\AppData\Roaming\.minecraft\libraries\com\paulscode\soundsystem\20120107\soundsystem-20120107.jar;C:\Users\ANGI\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl\2.9.0\lwjgl-2.9.0.jar;C:\Users\ANGI\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl_util\2.9.0\lwjgl_util-2.9.0.jar;C:\Users\ANGI\AppData\Roaming\.minecraft\libraries\argo\argo\2.25_fixed\argo-2.25_fixed.jar;C:\Users\ANGI\AppData\Roaming\.minecraft\libraries\org\bouncycastle\bcprov-jdk15on\1.47\bcprov-jdk15on-1.47.jar;C:\Users\ANGI\AppData\Roaming\.minecraft\libraries\com\google\guava\guava\14.0\guava-14.0.jar;C:\Users\ANGI\AppData\Roaming\.minecraft\libraries\org\apache\commons\commons-lang3\3.1\commons-lang3-3.1.jar;C:\Users\ANGI\AppData\Roaming\.minecraft\libraries\commons-io\commons-io\2.4\commons-io-2.4.jar;C:\Users\ANGI\AppData\Roaming\.minecraft\libraries\net\java\jinput\jinput\2.0.5\jinput-2.0.5.jar;C:\Users\ANGI\AppData\Roaming\.minecraft\libraries\net\java\jutils\jutils\1.0.0\jutils-1.0.0.jar;C:\Users\ANGI\AppData\Roaming\.minecraft\libraries\com\google\code\gson\gson\2.2.2\gson-2.2.2.jar;C:\Users\ANGI\AppData\Roaming\.minecraft\versions\1.6.2\1.6.2.jar net.minecraft.client.main.Main --username LoAngelus --session --version 1.6.2 --proxyHost localhost --proxyPort 8080 --version last --workDir C:\Users\ANGI\AppData\Roaming\.minecraft
---- YOU CAN CLOSE THIS LAUNCHER IF THE GAME STARTED OK ----
---- YOU CAN CLOSE THIS LAUNCHER IF THE GAME STARTED OK ----
---- YOU CAN CLOSE THIS LAUNCHER IF THE GAME STARTED OK ----
---- (We'll do this automatically later ) ----
Client> 2013-07-07 12:25:21 [CLIENT] [iNFO] Setting user: LoAngelus
Client> 2013-07-07 12:25:21 [CLIENT] [iNFO] (Session ID is --version)
Client> Completely ignored arguments: [1.6.2, --workDir, C:\Users\ANGI\AppData\Roaming\.minecraft]
Client> 2013-07-07 12:25:22 [CLIENT] [iNFO] LWJGL Version: 2.9.0
Client> 2013-07-07 12:25:22 [CLIENT] [iNFO] Reloading ResourceManager: Default
Client>
Client> Starting up SoundSystem...
Client> Initializing LWJGL OpenAL
Client> (The LWJGL binding of OpenAL. For more information, see http://www.lwjgl.org)
Client> OpenAL initialized.
Client>
Client> 2013-07-07 12:25:23 [CLIENT] [iNFO] Stopping!
Client>
Client> SoundSystem shutting down...
Client> Author: Paul Lamb, www.paulscode.com
Client>
Game ended with no troubles detected (exit code 0)
Deleting C:\Users\ANGI\AppData\Roaming\.minecraft\versions\1.6.2\1.6.2-natives-43934103004014
Couldn't delete C:\Users\ANGI\AppData\Roaming\.minecraft\versions\1.6.2\1.6.2-natives-43934103004014 - scheduling for deletion upon exit
Deleting C:\Users\ANGI\AppData\Roaming\.minecraft\versions\1.6.2\1.6.2-natives-43934103004014
Getting syncinfo for selected version
Queueing library & version downloads
Download job 'Version & Libraries' started (8 threads, 1 files)
Finished downloading C:\Users\ANGI\AppData\Roaming\.minecraft\versions\Forge8.9.0.774\Forge8.9.0.774.jar for job 'Version & Libraries': Couldn't connect to server (responded with 403) but have local file, assuming it's good
Job 'Version & Libraries' finished successfully
Launching game
Unpacking natives to C:\Users\ANGI\AppData\Roaming\.minecraft\versions\Forge8.9.0.774\Forge8.9.0.774-natives-43942565925017
Launching in C:\Users\ANGI\AppData\Roaming\.minecraft
Running: "C:\Program Files (x86)\Java\jre7\bin\javaw.exe" -Xmx1G -Djava.library.path=C:\Users\ANGI\AppData\Roaming\.minecraft\versions\Forge8.9.0.774\Forge8.9.0.774-natives-43942565925017 -cp C:\Users\ANGI\AppData\Roaming\.minecraft\libraries\net\minecraftforge\minecraftforge\8.9.0.774\minecraftforge-8.9.0.774.jar;C:\Users\ANGI\AppData\Roaming\.minecraft\libraries\net\minecraft\launchwrapper\1.3\launchwrapper-1.3.jar;C:\Users\ANGI\AppData\Roaming\.minecraft\libraries\org\scala-lang\scala-library\2.10.2\scala-library-2.10.2.jar;C:\Users\ANGI\AppData\Roaming\.minecraft\libraries\org\scala-lang\scala-compiler\2.10.2\scala-compiler-2.10.2.jar;C:\Users\ANGI\AppData\Roaming\.minecraft\libraries\org\ow2\asm\asm-all\4.1\asm-all-4.1.jar;C:\Users\ANGI\AppData\Roaming\.minecraft\libraries\net\sf\jopt-simple\jopt-simple\4.5\jopt-simple-4.5.jar;C:\Users\ANGI\AppData\Roaming\.minecraft\libraries\lzma\lzma\0.0.1\lzma-0.0.1.jar;C:\Users\ANGI\AppData\Roaming\.minecraft\libraries\com\paulscode\codecjorbis\20101023\codecjorbis-20101023.jar;C:\Users\ANGI\AppData\Roaming\.minecraft\libraries\com\paulscode\codecwav\20101023\codecwav-20101023.jar;C:\Users\ANGI\AppData\Roaming\.minecraft\libraries\com\paulscode\libraryjavasound\20101123\libraryjavasound-20101123.jar;C:\Users\ANGI\AppData\Roaming\.minecraft\libraries\com\paulscode\librarylwjglopenal\20100824\librarylwjglopenal-20100824.jar;C:\Users\ANGI\AppData\Roaming\.minecraft\libraries\com\paulscode\soundsystem\20120107\soundsystem-20120107.jar;C:\Users\ANGI\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl\2.9.0\lwjgl-2.9.0.jar;C:\Users\ANGI\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl_util\2.9.0\lwjgl_util-2.9.0.jar;C:\Users\ANGI\AppData\Roaming\.minecraft\libraries\argo\argo\2.25_fixed\argo-2.25_fixed.jar;C:\Users\ANGI\AppData\Roaming\.minecraft\libraries\org\bouncycastle\bcprov-jdk15on\1.47\bcprov-jdk15on-1.47.jar;C:\Users\ANGI\AppData\Roaming\.minecraft\libraries\com\google\guava\guava\14.0\guava-14.0.jar;C:\Users\ANGI\AppData\Roaming\.minecraft\libraries\org\apache\commons\commons-lang3\3.1\commons-lang3-3.1.jar;C:\Users\ANGI\AppData\Roaming\.minecraft\libraries\commons-io\commons-io\2.4\commons-io-2.4.jar;C:\Users\ANGI\AppData\Roaming\.minecraft\libraries\net\java\jinput\jinput\2.0.5\jinput-2.0.5.jar;C:\Users\ANGI\AppData\Roaming\.minecraft\libraries\net\java\jutils\jutils\1.0.0\jutils-1.0.0.jar;C:\Users\ANGI\AppData\Roaming\.minecraft\libraries\com\google\code\gson\gson\2.2.2\gson-2.2.2.jar;C:\Users\ANGI\AppData\Roaming\.minecraft\versions\Forge8.9.0.774\Forge8.9.0.774.jar net.minecraft.launchwrapper.Launch --proxyHost localhost --proxyPort 8080 --version last --workDir C:\Users\ANGI\AppData\Roaming\.minecraft
---- YOU CAN CLOSE THIS LAUNCHER IF THE GAME STARTED OK ----
---- YOU CAN CLOSE THIS LAUNCHER IF THE GAME STARTED OK ----
---- YOU CAN CLOSE THIS LAUNCHER IF THE GAME STARTED OK ----
---- (We'll do this automatically later ) ----
Client> lug 07, 2013 12:25:29 PM net.minecraft.launchwrapper.LogWrapper log
Client> INFO: Using tweak class name net.minecraft.launchwrapper.VanillaTweaker
Client> lug 07, 2013 12:25:29 PM net.minecraft.launchwrapper.LogWrapper log
Client> SEVERE: Unable to launch
Client> java.lang.ClassNotFoundException: net.minecraft.client.Minecraft
Client> at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:179)
Client> at java.lang.ClassLoader.loadClass(Unknown Source)
Client> at java.lang.ClassLoader.loadClass(Unknown Source)
Client> at java.lang.Class.forName0(Native Method)
Client> at java.lang.Class.forName(Unknown Source)
Client> at net.minecraft.launchwrapper.Launch.launch(Launch.java:53)
Client> at net.minecraft.launchwrapper.Launch.main(Launch.java:18)
Client> Caused by: java.lang.NullPointerException
Client> at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:171)
Client> ... 6 more
Client>
Game ended with no troubles detected (exit code 0)
Deleting C:\Users\ANGI\AppData\Roaming\.minecraft\versions\Forge8.9.0.774\Forge8.9.0.774-natives-43942565925017
Excuse me if this is a post irregularly. I'm italian.