Board Thread:Support Requests - Getting Technical/@comment-20013000-20140927103659/@comment-2093602-20140929113316

The problem lies with your Template:Imagewidth. It uses the  parser function, which does not exist by default. It is part of mw:Extension:ImageSizeInfoFunctions, which is not enabled on your wiki. You will have to request it to be enabled first.

It also seems that Template:Imagename (used in Template:Imagewidth) is missing too.

Edit: Btw, if you took the templates from another wiki, don't forget to credit them.