Agrarian Skies internal server crashing

[Isley]

Hey guys, I am pretty new to ftb but loving it so far. I am currently trying to play through agrarian skies and have recently started having issues. Whenever I try to open a reward bag or consume a heart the internal server crashes. If I restart I can then do this but after it runs for a little bit it will do this again. I am hoping someone knows how to resolve this issue.

 

[adamich]

any logs?