R Error: 'StageName' not found - Troubleshooting Guide

This error message typically occurs when R is unable to find an object called 'StageName' in the current environment or in any of the parent environments. It's possible that the object was not created or was deleted earlier in the code.

To resolve this error, try the following steps:

1. Check for typos: Make sure the object name is spelled correctly and matches the name used earlier in the code.
2. Verify object creation: Use the ls() function to list all objects in the current environment and see if 'StageName' is present.
3. Check object environment: If the object was created in a different function or environment, you may need to pass it as an argument to the current function or use the environment where it was created.
4. Re-execute code: If none of the above steps work, try re-executing the code from the beginning to create the object before using it.