I can't add a paper in which I am one of the co-autors to my Research Gate profile.
It keeps showing the next message: DOI (optional)This DOI is already associated with a different research item on ResearchGate. If the research item is yours, please confirm your authorship to add it to your profile. To continue editing the details of this research item, simply delete the DOI you entered. And after this, it shows "You can not claim this publication". Help please.