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When launching an OpenFlows product integrated with AutoCAD 2020 the following unhandled exception occurs;
Recently (starting in February, 2020) this specific unhandled exception has been known to occur for users integrating OpenFlows products with AutoCAD 2020 and is likely due to a Windows update that has broken the way in which AutoCAD components work with the Bentley product. As of March 3rd, 2020 this known issue has been escalated to product development (reference number 1081177) and a solution is expected to be available soon. Contact Technical Support for further assistance, or use the Standalone platform in the meantime. See the following article for the CAD-related functionality available in Standalone: CAD Functionality in Standalone as an Alternative to AutoCAD or MicroStation Integration
This unhandled exception may also be due to incorrect or incomplete installation of AutoCAD 2020. This interferes when interacting with OpenFlows products in the AutoCAD environment and the unhandled exception occurs when you launch the integrated version.
This may be resolved with a clean uninstall and reinstall of the AutoCAD 2020 application. Once AutoCAD 2020 is successfully re-installed you can re-integrate your OpenFlows product/s by going to Start > Bentley > Integrate “Product_Name” with AutoCAD. After this is done, try re-opening the integrated version. As mentioned above another workaround to this would be using the standalone version of the OpenFlows product and leverage the CAD functionality of OpenFlows products. (see link below)
CAD Functionality in Standalone as an Alternative to AutoCAD or MicroStation Integration
AutoCAD Integration Troubleshooting