Passolo 2016 unable to import translation with errorcode:-1

Hello,

I am using Passolo 2016.
I exported an Passolo xml file and had it translated, but I failed to import it back.
It only shows "ERROR - Error processing import/export file. Errorcode: -1"
Is there anything wrong with my file? (I've checked for the file format and language code and they are all correct.)
Please help.
Thanks in advance.

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