'A Java Exception has Occured' appears on launch of FTB Monster

[Timeseer2]

Title:

cannot launch ftb Monster​

Launcher Version:

v1.4.7​

Modpack:

FTB Monster​

Modpack Version:

recommended​

Log Link:

​

Details of the issue:

when i try to launch Ftb Monster this appears
'A java exception has occurred ' and within the console this appears:

Exception in thread "main" java.lang.NoClassDefFoundError:joptsimple/OptionSpec

I have tried degrading java and reintalling both it and ftb and the modpack but

neither had any affect ftb monster does not have optifine so this cannot be the

problem i would be grateful if someone were to help me with this issues​

 

[lenscas]

Do you use java 8?
Then there is a mod you have to install.
I can not google for it right now but just search for minecraft forge fix and you should be able to find it.

 

[Frost F1re Drag0n]

Do you use java 8?
Then there is a mod you have to install.
I can not google for it right now but just search for minecraft forge fix and you should be able to find it.

can you at least tell us what the name of the mod because i still can't find it

 

[mc.crab]

This: http://files.minecraftforge.net/LegacyJavaFixer/legacyjavafixer-1.0.jar Based on the error I'd say the legacyfixer might not fix it. If it doesn't, post the full log.