Error when returning Trados files to Mantra TMS--"Filetype with ID AemXml not found"

Hi Team,

Whenever I am transferring files (after translating them) from Trados Studio to Mantra TMS, I get a message saying that the files verification returned errors. When checking the errors, I see this: "Filetype with ID AemXml not found." It seems to be a warning rather than an error, but still. Am I missing anything? 

Also, where/how do I upload the TM used for translating a certain file when transferring the files to Mantra?

Thank you in advance.

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