Problem with W3M Map Utilites..

Help .. allways when im trying make a button (Etc. --> Edit Button) im getting error while saving as .BLP:



But its not only while making buttons, all tools with BLP gives error while do something with .BLP files, please help me!

I get the same error. Just save it as .tga and use Wc3 Viewer to convert it to .blp.