Error in evale x parentframe object StageName not found

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 is possible that the object was not created or was deleted earlier in the code.

To resolve this error, you can try the following steps:

1. Check if you have misspelled the object name. Make sure that the object name is spelled correctly and matches the name used earlier in the code.
2. Check if the object was created earlier in the code. You can use the ls() function to list all the objects in the current environment and see if "StageName" is present in the list.
3. Check if the object was created in a different 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. If none of the above steps work, try re-executing the code from the beginning to create the object before using it