Help Needed

[Arctoris]

So I am in the process of making my own modpack

Come across a new hurdle, and was wondering if I could get some help as nothing online can explain this to me. I see you usually ask for pastebin logs so I will provide one

https://pastebin.com/GHG6ZZhj

[Munaus]

this doesn't belong in Bug Reports, as this is not a bug with the Launcher.
Moved to Platform Pagoda for discussions about custom modpacks

 

Exception in thread "main" java.lang.NoSuchMethodError: joptsimple.OptionParser.allowsUnrecognizedOptions()V

it's impossible to tell what this error is. post your link to the modpack so others can see how you set it up

Edited June 9, 2018 by Munaus