Example 2-1 Mathcad Prime 1 not working.

When I enter cos(pi) in the expression for example 2-1 I get the follwing message: "The_type_initializer_for "MccDynamicEfi. Values"_threw_an_exception....

What is going on? I have used MathCad before but not MathCad Prime. Any help will be appreciated. Thanks. Julio