Error in PDF translation Tag pair "<cf color="110E0C"></cf>" is missing. Consider adapting the translation.

Hello,

I am translating a single document in PDF format. I got an error :"Tag pair "<cf color="110E0C"></cf>" is missing. Consider adapting the translation. " when translating a segment. The error refers to a color, however the font color from the pdf to the target language looks the same in Trados. How do I fix this error?