Blood for the Baron!

Wasn't sure where to post this but i'm trying to use a picture for an avatar, and it keeps saying It "was not possible to determine the dimensions of the image."
This is the picture if that means anything

Does anyone know what I should do?

I managed to change it for my avatar no problem, just leave the dimension fields blank.

For reference, though, it is 145 x 135. Right-click on the picture and hit Properties.

LMK if it continues to mess about.

Okay, it's working now. Don't know what I did differently 'cause that's what I did last time. Ah well, maybe it was just having a bad day XD Thanks for the help