Most likely a misconfiguration on server side. The following FAQs [1] and [2] might help to debug your issue. Especially [2] has a part about “No E-Tag” there.
Also quoting from an existing thread in [3] which pops up in the search of the forums:
Unfortunately this is a “catchall” error which can have tons of solutions so you probably need to dig your way through google or the github issue tracker [1] for the message The server did not acknowledge the last chunk. (No e-tag was present) to find a solution matching your problem.