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missing-desktop-file
Found an AppStream MetaInfo XML file, but the associated .desktop file is missing. This often happens when the .desktop file is renamed, but the <launchable type="desktop-id"/> tag value of the AppStream MetaInfo file is not adapted as well, or if the MetaInfo file is located in a different package than the .desktop file.
Please fix the packaging or work with upstream to resolve this issue.
For older metadata, the desktop-id is inferred from the <id/> tag. If the component metadata has no launchable tag and no icon tag of type stock, check if a .desktop file named after the component-ID is located in the same package.

missing-launchable-desktop-file
The MetaInfo file references a .desktop file with ID 'org.openmw.launcher.desktop' in its launchable tag, but the file was not found in the same source tree. In order to be able to launch the software once it was installed, please place the MetaInfo file and its .desktop files in the same package.