Help with tail light on my 1997 honda civic..?

i just changed the tail lights on my car. the Right 1 had burnt out so i decided to change both. I tested it an pressed the breaks an it still isnt working. the light on left works fine. BUT the one on the right isnt working at all.

What could be the problem, and how can i fix it. ??

THANK YOU
Yes it doest look like there is corrosion .. How do i clean it?
 
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