Closed 2.5.2: mobs aren't spawning

[Lynx_Blue]

Version:
2.5.2

What is the bug:
Idk why but ive made a dark room in my base to get some bones but its not spawning anything.....i had the same problem on another world and i have no idea ehy its happening, is it something im doing wrong bc i have looked in the forums and can't find anything

Mod & Version:


Paste.feed-the-beast.com log:


Can it be repeated:


Known Fix:

 

[PabloElmundo]

Is it 25 blocks away from your spawn? Best to go even further to be honest, but that's the minimum distance