Built-in flash will not pop up when required. error message appears

I have this problem too. I can manually pull the flash up but have to do it every time I take an inside picture. Any suggestions on how to permanently fix?

I had the same trouble with my T3-i. I used a small file to enlarge the hole that the clasp uses to hold the flash down. I did this extremely carefully as to not remove too much of the plastic, so that the flash would still be held down when not in use. I did this about 3 years ago and it has not caused me any trouble after the repair and it only took a few swipes of a file.