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Hi,
Im also new on Revit and i encountered that message, How do i know if the parameters is correct? how to check ? please help me.
This Worked for me:
When you have selected your duct and have clicked on the diffuser you see a preview of the duct and on the top right corner there is an option highlighted called "add vertical." Select the option next to it called "change slope". This worked in my case for the same error.