What does the 'metainfo-filename-cid-mismatch' error signify?

[quyykk]

While building an AppImage it failed because of metainfo-filename-cid-mismatch. But what does the error mean? There is zero documentation on this anywhere. I tried to read the AppStream spec, but couldn't find anything that would explain this error.

Thanks!

[quyykk]

Found it, for all those coming from search engines: The <id> tag should be the name of the file: <id>.appdata.xml (or metainfo).

[ximion]

Yes. In case you are unsure about an error, you can also always pass --explain to get a verbose explanation: appstreamcli validate --strict --explain <filename>