My dark room mob spawner isn't working

Best Answer
How far away are you exactly from the spawner? And the spawner wich is in the sky works best if its daytime because then the land is lit up, also try to light up as many caves under your mob trap and in the area. Make sure you're not playing on peacefull and if you made the mob trap good, didn't forget any torches in there, didn't forgot to place the water etc..
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