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Hi ,
That error looks like renamecol isn’t defined in your workspace. Have you loaded the dbmaint.q script?
To check, you can run simply
renamecol
it should return the definition of the function if dbmaint.q has been loaded.
If it throws the same error as your screenshot, the script has not been loaded, and you’ll need to go back to 1.1 and re-read the hint.
Hope this helps,
Laura