I encountered this error. It too was a missing .jpg file in the DESIGNER.
BTW, the error message on a second (larger) monitor is not fully visible. On the primary monitor it is in the center of the screen
This particular one fits OK, but when the filename is longer you can not see the file name unless you move it to the primary screen.
Finally, I think the zip backup should occur even if these types of errors exist...
Rusty