I am not asking you to support anyone, i am showing you a critical error that causes "your" FTB software to crash due to a mod within a modpack recommended by "FTB" software team. The link i posted shows the exact error and crash report and reason behind the crash. I reported it to mcpc+ first thinking they could do something to fix it but referred me to FM mod which again is in "FTB" mod pack.
The instant you use MCPC+ you have changed the modpack. Which can cause any number of errors, including errors with mods that are not compatible with MCPC+. In your case it might be FM it might be FM not playing well with MCPC+ . While we will be updating to a fixed FM as as we can, we can't guarantee it will fix MCPC+ issues.