Trados does not allow me to convert the files to translate in a translatable one

Dear Collegues, my name is Jesus and herewith we would like to arise a problema is happening to me when starting a studio Project. I had started to translate when in a segment trados did not find any ending tag that matched the context.

When I erased the format to the doc file I loaded again the file to translate and finded the same error. After throw up to the recicle bin the entire Project and now to start a new one from scratch and using the same doc file to translate trados says me that is not able to convert the file to a suitable format to translate. The error says also that a translation memory can be damaged.

What can I do to solve this?

Thanks in advance