Playing the Infinity Lite pack, as soon as I loaded chunks around my Botania setup I experienced the following crash. Numerous log on attempts yielded the same crash. Using 7 gourmaryllis flowers with 7 spreaders pointed to a mana distributor.

Crash Log: http://pastebin.com/FReqsvXQ

The only other entity throwable datawatcher in the area would be the vanilla MC dispensers

I get the exact same crash on Infinity Lite v1.0.1 I have no other mod even close to my botania setup. All I have is 6 endoflames with a pressure plate holding a hopper locked untill the coal goes away. All is done with vanilla redstone. As soon as I drop 1 coal on the flowers I crash with the same error.

http://pastebin.ubuntu.com/23467712/

Update: After a server restart it now works. So something somewhere is not working as intended? :)

@garlicinyoureye the DataWatcher is a special property of the entity, nothing to do with blocks.

@yrsegal ah, thank you for the information.

It's so easy that crash with other mods.
I found lot of mods can crash entity.manaburst.

Is that possiable from forge out of date?

This is another mod, messing with the entitythrowable datawatcher. Not botania's fault.

Hmm.. I'm using vanilla dispensers, maybe the RFTools timer that's emitting pulses to dispensers. Possibly the culprit then?

gotcha, problem is I can't even get close to that chunk before client crashes.

There's pretty much no way to know from just the crash log, so you'd have to remove mods one by one until the error was resolved to figure it out.

Thanks for the input yrsegal

This crash happens because minecraft's entity data manager can not find the right type of data there. Which means another mod is messing with it somehow. Sadly there is nothing I can do about this.