Problem Console Error

[PathfinderC24]

I run an private FTB Unleashed server and I have been getting this error on the console:

[Server] WARNING API ERROR: ic2.core.block.machine.tileentity.TileEntityMatter@ab0d5c0 (0:779,73,-329) didn't implement demandsEnergy() properly, no energy from injectEnergy accepted (511) although demandsEnergy() requested 511.

What is this error and is there a way to fix it. Thanks

 

[PathfinderC24]

Also, this seems to be causing ALOT of lag, if anyone can help please do.

 

[cjm721]

There is quite a bit of that spam on my server also, but I don't notice any lag via it. If your convinced it is causing lag you have the coordinates of the block in that message.

 

[PathfinderC24]

Turns out that there was a mass fab kinda hidden under a floor of a base, and there was a lot of uu on the floor. Thanks for pointing that out .