Hello Maggie, Could you please let us know on below queries to find out the root cause. 1. Have you recently installed any lates AutoPLANT/OpenPlant Isometric Manager version? 2. What version was used to create the project showing error? 3. Do you get same error on a newly created project or other projects? Also, check if the project still has orignal schemas. You need to check the available schemas in the project and also the schemas listed in OpenPlant.pcf. We will wait for your feedback. Regards Dinesh
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