Forum Post: [OPIM U8] Error:Error reading label configuration from style IFC. - Value cannot be null

Hello All, I have an old project about 2 years before which uses OPM U6 + OPIM U8, there was no problem. But when I try to extract ISO in recent days, the following error message shows: Error:Error reading label configuration from style IFC. - Value cannot be null. at Bentley.Isometrics.IsoExtWrapper.GenerateIsometrics.Execute() at Bentley.Isometrics.IsoProduction.PipeGenerateIso.Process(IsometricInstance isoInst) at Bentley.Isometrics.IsoProduction.ProcessingPipes.ProcessIsoInstance(BackgroundWorker bWorker, IsometricInstance isoInst, Boolean& success) If launch style editor, such error message will show: I am sure the OPM/OPIM versions are correct, the model file is OK (all ISOs fail whatever old pipeline or a new pipeline with one pipe only,), the worksets in PW are OK(The project exist in two PW datasources, problem in both datasources), I have cleared all the local PW folders. Since different verisons of OPM and OPIM, there is no other projects use such OPM/OPIM. Is there any clue? Thanks a lot.