The server is down at the moment, I run into this bug, and need to fix the world with MCEdit. Look into it in the morning...
Bug in TFC-B79.14:
Name: Hot Item Empty Barrel (Severe)
Description: Game crashes when placing hot items such as food or ingots in barrels that have no liquid to cool the item down. Crash report contains
java.lang.NullPointerException: Ticking block entity
Note: The crash report will contain the coordinates of the barrel/large vessel causing the crash in the Details: section. The only current solution to this problem is to delete the barrel using 3rd party software such as MCEdit