Error message: "A font with the same name is already installed" but never installed the font

Hi,

Recently we used some Adobe fonts in one of our Mac and when we used the same Adobe account to login in our InDesign server CC 2014, we found these fonts  couldn't be  activated and it showed "there are conflicts of fonts".  When we opened the CC font manager to re-activate and sync these fonts, they all kept showing this error message: "A font with the same name is already installed". But this font was NEVER been installed as an local version in our Mac.

We tried to solve this according to the troubleshooting guide on Adobe Help site and also tried to use another  CC account  to login but the problem was never been solved. We searched on Adobe Support Community and  found that it also occured to someone  and  his problem was never been solved, either. (though he is luckier than us that he can still use the font even with the error message)

Are there any ways to solve the problem we encounted? Any suggestions may help. Thank you very much.

Tyrus