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When launching an OpenFlows product integrated with AutoCAD 2020 the following unhandled exception occurs;
This unhandled exception is 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 can 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.
The integrated version will now run as expected.
The workaround to this would be using the standalone version of the OpenFlows product and leverage the CAD functionality of OpenFlows products.
CAD Functionality in Standalone as an Alternative to AutoCAD or MicroStation Integration
AutoCAD Integration Troubleshooting