Why is my nikon d3100 saying error?

My camera says error press shutter release button again and it has a dark blurry film when i look through the lens

Added (1). My boyfriend was cleaning off my bed and threw my very nice camera on the floor after all ready being broken and i picked it up angerly and vwlla it was fixed it must have been a reversal from being dropped before

Some of the Nikons tell you the battery is very low by acting dysfunctional. Try recharging the battery and see if that helps.

Experimenting with my D90 (with an adequately charged battery):
When the camera is turned off, the view in the viewfinder is still bright and clear. I can manually focus with it turned off. However, if i remove the battery, it becomes dark and blurry like the view you described. Of course with no battery power at all there are no messages displayed in the LCD's.