I am trying to upload a very simple extension but I am getting an error when I try to upload the extension zip file.

Here is the error message:
"persona.ini is invalid. Please correct it and try uploading again. The parser reported: Invalid persona.ini file, background image property not found. Please fix it and try again.
"

I am trying to upload a very simple extension but I am getting an error when I try to upload the extension zip file.

Here is the error message:
"persona.ini is invalid. Please correct it and try uploading again. The parser reported: Invalid persona.ini file, background image property not found. Please fix it and try again.
"