Hi, 
   I am facing some issue when opening C_Group faceplate with Object List  in client PC .we are not able understand about error which is coming .Pic attached for better clarity about error which is coming.

WinCC-Server Name: OSSV1 --> OK

Get the PLC Name from OSSV1

ERROR No.=1057 : CematAPLObject - Aplication-Defined or

Thanks.

Closed because posted twice. The active topic can be found here:

Error When Opening C_Group Object List in OS client PC

Kind regards, Moderator_Lan