Themeroller exits with 'Http Error' message

Hi,
I recently installed Gallery3 w/ the themeroller. I downloaded a standard JQuery theme and tried to upload to my site. In the process of uploading, it always exited with the following message: "Http Error" (image attached). Has anybody seen this? Is there a way I can apply a JQuery theme without going through the "Themeroller" module?

Thanks a bunch in advance.
Tim