It’s a community extension and I’ve got this error at the final step, when I want to uplad the file. I think the file is uploaded but the system don’t find what it want to inside the archive.
Incredible ... One month later, nobody can help me ... The sentence “Release refered to unknown or non-existent extension” has been writting by a programmer ! Can’t he tell me what’s wrong ???
Tx
PS. Maybe some files can help you ...
I had this problem too.
This means that you have to have the same name for your extension in both your archive and the upload form ("Extension File Name” field).
In your package, the extension name is “NetAmbition_DirectResize”, so just give the same name in the upload form.
IMO, it’s not very easy to understand (maybe Magento team could explain it better in the form ?).