why am i getting this error when trying to share a picture to facebook from my instagram? pls help?

[♥Joliely♥   Â]

ok so when i click on share it pops up a message saying "instagram would like to port to your friends on your behalf" so i click Ok than a message pops up saying " facebook login failed""make sure you've allowed to use facebook in iOS settings.privacy.facebook" and i click ok and i checked my privacy setting s and everything is good, and i used to share my photos all the time but this is the First time that its not letting me,,, how can i fix this ?? please help me

[JuanRa]

Try to defragment your computer.