Good Gregor I refer to you since I have a problem, exactly this one that is commented in the thread that I leave you in the following link.:
ProcessBook initialization errors (osisoft.com)
I can not access the link you propose to solve it:
PI Processbook keeps prompting error "The Host Add-Ins could not be initialized"
When i try yo go in it, it says that i dont have right access, could you help me, thanks.
