ERROR WHILE CREATING WIDTH PARAMETER FORMULA IN REVIT26

[saabithmhd]

Tried to build Room_tag in Revit 2026.
The [length] calculated parameters to label (Formula : (Perimeter + sqrt(Perimeter ^ 2 - 16 * Area)) / 4) worked.
But when it comes to [width] calculated parameters to label (Formula : Area / Length) did not work.

It is showing:
The following is not a valid parameter: Length
Note that parameter names are case sensitive.

[Mike.FORM]

The length parameter supposed to be all lowercase as in "length" not "Length" how your formula has it written.

That's specifically what the error is stating.

[saabithmhd]

TRIED EVERY TYPES : LOCERCASE, UPPERCASE, MIXED NO USE

[Mike.FORM]

Have you copy + pasted the length parameter name?

[ToanDN]

You do not have Length parameter in your available parameters.  Add Length parameter before creating the calculated formula.

[RLY_15]

If you're using multiple calculated parameters, you have to finish creating the first one before the next one refers to it. In your screenshot, you started with a blank label; you don't have the calculated parameter 'length' defined anywhere.

Also, when you create a calculated parameter in a Label, it only exists in that specific Label.