Error: No bilingual review file mapping was specified

I want to update an Xliff file with an external review file. I run this code:

I get this error:

"No bilingual review file mapping was specified for: [\\\\TTN29\\TTN29_D\\TtnD\\Cat\\LocalProjects\\1_51851_FRE_SDL_PAK_CO\\fr-FR\\1_51851_1_3.docx.sdlxliff]"


However, when I open the project file, the mapping seems to be here in the code:

Why do I get this error message when I run the manual task method: UpdateFromExternalReview?


Regards

Martin