Problem Description
The error "Failed to evaluate variable" occurs.
Solution
An error occurred when evaluating a variable. The domains in which COMSOL Multiphysics tried to evaluate the variable are indicated. Also, the error message shows the expression that COMSOL Multiphysics was unable to evaluate. Make sure that the variable is available in that part of the model and if so, that you have defined the variable correctly in the indicated domains.
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