How do I get small flies/gnats out of my worm bin?

I opened the bin today and there were a bunch of gnats flying around in it and some of the top layer had mold. What should I do?

Answers:
Put in a screen on the opening of your compose bin. Also remove the mold. I hope this helps you!!

Other answers:
you need to remove the mold asap
you need to remove the mold asap
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