So I just updated to tekkit 3.0.3 and when someone on the server uses the activation part of the RM tools it drops little black balls when someone picks up the black balls it causes the crash.
This is the error
Failed to handle packet: java.lang.IllegalArgumentException: Can't create an EntityItem for a null item
CONSOLE: create an EntityItem for a null item
Sorry If someone else made a post about this I did not see any other post on this.
I just noticed that I posted this on the wrong section sorry