Help M3 stuck in manual mode

[petrolhead]

I was all fingers and thumbs today taking a photo and noticed the camera with the 15-45 lens was in manual mode.

If I press MF on the rear dial it is still in manual mode.

How do I get it back to auto focus mode

 

[petrolhead]

Opps sorted.

I removed the lens and then re attached

Thought I would reply in case anyone else has the same problem