The Code Conversion Utility replaced a node in your code with a placeholder node. This version of LabVIEW NXG does not support the node you attempted to convert.
Replace the placeholder node with a supported node or consider removing the node if it is not essential.
If the previous suggestions don't restore the functionality of the affected code and the code isn't essential to the core functionality of your application, you can remove the portion of code. If the code is part of the core functionality of the application, you can use the VI Interop node to call your existing code, provided that the new code organization meets the architectural goals of your application. If neither solution meets the requirements of your application, do not migrate to LabVIEW NXG at this time.