Minecraft Forums

I was playing with minecraft 1.7.2 optifine and decided to play with 1.7.9. I got optifine from the webstite and installed it. When I pressed play I got this error.

[13:08:20 INFO]: Launching game
[13:08:20 INFO]: Unpacking natives
[13:08:24 INFO]: Launching in
[13:08:24 INFO]: Half command:
[13:08:24 INFO]: Looking for orphaned versions to clean up...
[13:08:26 INFO]: Looking for old natives & assets to clean up...
[13:08:28 INFO]: Client> May 17, 2014 1:08:27 PM net.minecraft.launchwrapper.LogWrapper log
[13:08:28 INFO]: Client> INFO: Loading tweak class name optifine.OptiFineTweaker
[13:08:28 INFO]: Client> May 17, 2014 1:08:28 PM net.minecraft.launchwrapper.LogWrapper log
[13:08:28 INFO]: Client> INFO: Using primary tweak class name optifine.OptiFineTweaker
[13:08:28 INFO]: Client> May 17, 2014 1:08:28 PM net.minecraft.launchwrapper.LogWrapper log
[13:08:28 INFO]: Client> INFO: Calling tweak class optifine.OptiFineTweaker
[13:08:28 INFO]: Client> OptiFineTweaker: acceptOptions
[13:08:28 INFO]: Client> OptiFineTweaker: injectIntoClassLoader skipped, OptiFine is loaded as a library
[13:08:28 INFO]: Client> OptiFineTweaker: getLaunchArguments
[13:08:28 INFO]: Client> OptiFineTweaker: getLaunchTarget
[13:08:28 INFO]: Client> May 17, 2014 1:08:28 PM net.minecraft.launchwrapper.LogWrapper log
[13:08:28 INFO]: Client> SEVERE: Unable to launch
[13:08:28 INFO]: Client> java.lang.ClassNotFoundException: net.minecraft.client.main.Main
[13:08:28 INFO]: Client> at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:179)
[13:08:28 INFO]: Client> at java.lang.ClassLoader.loadClass(Unknown Source)
[13:08:28 INFO]: Client> at java.lang.ClassLoader.loadClass(Unknown Source)
[13:08:28 INFO]: Client> at java.lang.Class.forName0(Native Method)
[13:08:28 INFO]: Client> at java.lang.Class.forName(Unknown Source)
[13:08:28 INFO]: Client> at net.minecraft.launchwrapper.Launch.launch(Launch.java:127)
[13:08:28 INFO]: Client> at net.minecraft.launchwrapper.Launch.main(Launch.java:27)
[13:08:28 INFO]: Client> Caused by: java.lang.NullPointerException
[13:08:28 INFO]: Client> at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:171)
[13:08:28 INFO]: Client> ... 6 more
[13:08:28 INFO]: Client>
[13:08:28 INFO]: Game ended with no troubles detected (exit code 0)
[13:08:28 INFO]: Following visibility rule and showing launcher as the game has ended

I removed alot of code to save reading time.
I had to have a problem it stoped without me telling it to.

I have the same problem I got the newest version of optifine for 1.7.9 and I still had the same problem.

Quote from lovemooshroom1

you need optifine for 1.7.2

I had optifine for 1.7.9 do I need to change to 1.7.2 optifine?