objektiv don't want to go back
Objektiv dont gos back in the camera house ..... Just tells that objektiv problems on the screen....
Most likely the lens mechanism is jammed. This may happen because of dirt getting in - a few grains of sand will do it - or because the lens barrel got knocked.
Here's a general guide for resolving this type of problem.
And here's another, written by someone who I believe is also a iFixit contributor ;)
If the lens refuses to budge after you tried the various solutions offered in the guides linked above, take the camera to a reputable repairperson for a quote.