How to forcefully make a variable positive during the iteration. For example during the iteration, the argument of the log was always coming out to be negative hence causing the convergence error even though defining its min value to be zero.

Regards

What do we mean by the error " <builtin>: recipe for target 'PropaneDH.flowsheet_12jac.o' failed" ??
Regards   
P.S. It is an error while compilation.