How to sync OPPM with Plantsight

I have the model BT-3D-PLANT in Openplant Modeler and i associate in Openplant Administrator. But when I click on setup it failed with detail "ProcessFunctional schema already exist in iTwin and when i click Sync to iTwin on Openplant Modeler it say Turn on Sync mode but i aready turn it on with OP_PLANTSIGHT_SUPPORT = SYNC. I will appreciate if you can show me the worksteps and how to fix it.