Hello @Pedro_Pimenta,
Welcome to the forum, and thank you for your question.
As you will notice, this seems like a duplicate of How to convert from Microsoft Word (.doc or .docx) to Typst? - #2 by quachpas where you will find a suggestion.
Could you please describe the process you are using that raises that error? Which tool are you using?
A potentially working solution (I have not tried it) would be to use Pandoc:
pandoc input.docx -t typst -o output.typ
and if the document contains images:
pandoc input.docx -t typst --extract-media=media -o output.typ