All Arguments Must Use the Same Data Type and Compatible Units

If you get this error, make sure all arguments in the Expression have the same Data Type.

//helpcenter.graphisoft.com/wp-content/uploads/ac22_help/040-elementsvb/MustUseSameDataType.png

Example: Add a Number to a Length?

SUM (1, 2m)

This is incorrect, because the two arguments use two different data types: 1 is a Number, 2m is a Length.

Yet n the SUM Function, all arguments must use identical data types. (You can see this by opening Expression Editor and hovering over the SUM item.)

//helpcenter.graphisoft.com/wp-content/uploads/ac22_help/040-elementsvb/SUMArgumentTypes.png

Solution

Change the expression so that both arguments use an identical Data Type (here, Length in meters).

SUM (1m, 2m)

The resulting Property is also a Length. Make sure the Property’s Data Type is set to Length.