Metadata corrupted or altered!

Metadata corrupted or altered! Metadata does not contain the required keys and formats. Please make sure to generate the metadata.json file with the latest version of the addon.
This message indicates that the metadata.json does not have a good format. Some internal parameters may have been altered so that the expected information is not available or is of the wrong type. This can indicate that the metadata.json file was altered after it was generated by the add-on.