The following error occurs: "Undefined variable."
This error indicates that a variable used in some setting is undefined. It might be a spelling error, or a name of a variable that has not been defined or that is not valid in the part of the geometry where the error occurs. The Error window contains the name of the variable, the geometry, and the domain (or other geometric entity) where the error occurred. In the Settings windows, undefined or unknown variables are indicated by an orange color.
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