I can not generate target translation

Hello, I have an IDML original file translated form Italian into Serbian (Trados Studio 2021). When I try to finalize or generate the translation, I receive the following error: "Italic is an unexpected token. Expected white space. Line 184, position 1261"

No way to solve the problem! Creating a new project, applying perfect match, using a previous version of Trados Studio (in this case I can finalize BUT the target file generated is corrupted and can not be opened in Indesign): nothing seems to work! 

It is a big file (more than 200 pages manual).

Any suggestion?

Thank you for your help!!

Silvia

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