"Stream Read Error" using Design for mod vehicles

[jbmetrics]

I did some digging around and found the following:

This error results when the graphics library used by the Application to load bitmaps is unable to read a particular bitmap. In the case of your new bitmaps, the program used to create them has used a bitmap format that the graphics library used by the Application either thinks is invalid, or does not support.

So now the question, what do the bmp settings need to be (I am using Adobe Photoshop CS)?