Can't launch any modpacks

[KevinMelon]

Title:

Can't launch any modpacks​

Launcher Version:

1.4.7​

Modpack:

FTB Infinity​

Modpack Version:

1.4.0 with other mods​

Log Link:

http://paste.feed-the-beast.com/view/6a40f26c​

Details of the issue:

I click launch, the launcher closes for a few seconds, then goes back to the launcher. I've been playing Infinity for a while and this started happening today. You can e-mail me at [email protected]​

 

[Alex Durrani]

This is happening on all versions of FTB Infinity. I tried 1.5.0, 1.4.1, and 1.4.0 without any luck.

 

[DoctorCZE]

I HAVE SAME PROBLEM BUT I CANT START IT http://paste.feed-the-beast.com/view/4d7e822e

 

[jikuja]

Maybe you should list mods you are added or do we need to compare crashlog and official modlist?

[17:37:01] [main/INFO] [FastLeafDecay]: Found Leave Class: net/minecraft/block/BlockLeavesBase
[17:37:01] [main/INFO] [RandomThingsCore]: Found Leave Class: net/minecraft/block/BlockLeavesBase
...
Caused by: java.lang.NoClassDefFoundError: net/minecraft/block/BlockOldLeaf

Check those coremods. They are probably trying to do same thing

 

[Alex Durrani]

I am have added any mods to the core modpack for Infinity. This is only happening on my iMac and not on my windows based computer. I have installed 1.4.7 launcher.