Well.... its actually pretty easy to fix the issue:
1- open RFTools.jar with a zip program (ex: 7zip)
2- go to assets/rftools/text
3- extract the file called manual.txt to your PC
4- rename the manual.txt in your PC to manualUS.txt
5- add the file manualUS.txt to the zip in the same location manual.txt is.
Problem solved since the crash is that for some reason, the mod tries to read the localized manual file instead of the generic one!
Another alternative, if you dont want to alter the jar file is recreating the directory structure in your resourcepack folder and put the manualUS.txt file there.
Not sure if this works, never tested it but if the file is accessed like a resource, Minecraft should be able to access to it that way too!
1- open RFTools.jar with a zip program (ex: 7zip)
2- go to assets/rftools/text
3- extract the file called manual.txt to your PC
4- rename the manual.txt in your PC to manualUS.txt
5- add the file manualUS.txt to the zip in the same location manual.txt is.
Problem solved since the crash is that for some reason, the mod tries to read the localized manual file instead of the generic one!
Another alternative, if you dont want to alter the jar file is recreating the directory structure in your resourcepack folder and put the manualUS.txt file there.
Not sure if this works, never tested it but if the file is accessed like a resource, Minecraft should be able to access to it that way too!