Traceback (most recent call last):

 "/usr/lib/python3.4/logging/__init__.py", line 980, in emit
stream.write(msg)UnicodeEncodeError: 'ascii' codec can't encode characters in position 287-288: ordinal not in range(128)
Traceback (most recent call last):


 "<stdin>", line 1, in <module>


 ".../pyomo/pyomo/core/expr/numvalue.py", line 226, in value

tmp = obj(exception=True)


 ".../pyomo/pyomo/core/expr/numeric_expr.py", line 223, in __call__

return evaluate_expression(self, exception)


 ".../pyomo/pyomo/core/expr/visitor.py", line 973, in evaluate_expression

return visitor.dfs_postorder_stack(exp)


 ".../pyomo/pyomo/core/expr/visitor.py", line 518, in dfs_postorder_stack

flag, value = self.visiting_potential_leaf(_sub)


 ".../pyomo/pyomo/core/expr/visitor.py", line 893, in visiting_potential_leaf

return True, value(node)


 ".../pyomo/pyomo/core/expr/numvalue.py", line 230, in value

% (obj.name,))
ValueError: No value for uninitialized NumericValue object y
