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I'm developing a gadget for a project. However, tonight I lost about an hour or so searching for a solution for the following error: "this is not a valid gadget package". This error was thrown when I tried to install the gadget (after renaming the ZIP file).
It appears that this error was thrown because of a CSS file that I had prepared in advance for the flyout option. This file was 0kB, and thus when checking the gadget, the sidebar declares the entire gadget invalid.
1 hour of development time lost :-(