Failed to save target content: Name cannot begin with the "<" character

I have a Freelance 2018 Trados Studio version.

Upon completion of my translation, I tried to save it as a word document using the option "save target as". 

I received the following erro message: Failed to save target content: Name cannot begin with the "<" character, hexadecimal value 0x3C. Line 2, position 3226.

Solutions presented in this platform for similar problems (eg https://gateway.sdl.com/apex/communityknowledge?articleName=000001913)  were not helpful as I cannot just open the .sdlxliff file. and search for the string "<" to delete it as this is not a string and I find myself with dozens of "<" characters.

The source document is a PDF document, could that be part of the problem?

Thank you,

João Vasconcelos

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