The error "Internal evaluation error: unexpected NaN encountered" occurs.
This error occurs when Not-a-Number (NaN) values appear unexpectedly. Such values can be the result of floating-point operations such as 0/0, resulting in undefined or unrepresentable values (see http://en.wikipedia.org/wiki/NaN). A possible cause is improperly defined coupling operators. As a first step, check that the definitions of the source and destination domains of any coupling operator or periodic boundary conditions are correct.
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