Question: Error, `GlobalOptimization` does not evaluate to a module

I am trying to use global optimization to solve a problem, but get an error:
 

> GlobalOptimization:-GlobalSolve(R, {eq}, h = 50 .. 10000, R = 50 .. 10000, maximize);


Error, `GlobalOptimization` does not evaluate to a module

What is meant by this error?

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