Error - Division by zero

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Hi, can anyone help me. I am trying to set a temperature on a boundary surface. With a constant parameter it is running, but I want to it with the equation of Clausius-Clapeyron. For this I set an analytic function with the equation: 1/((1/T_ref)-((Rs/h_fg)*log(p/p_ref)))

Then I selected the preferred boundary. While computing there appears this error:

Division by zero. - Function: / Failed to evaluate expression. - Expression: d(1/(1/T_ref-(Rs*log(T_int__p__internalArgument/p_ref))/h_fg), T_int__p__internalArgument) Error in user-defined function. - Function: dT_int_dT_int__p__internalArgument


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