Validating userform combobox selection with vba and getting an error

So I am using the following code to let the user know they need to select or type an option in the dropdown. It works just fine when I define the name of the combobox but when I try to set it up as a sub I get a "Run-time error '424':" "Object Required". What am I missing?

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It appears to be working just fine now I just forgot to put a "Call" in front of the sub name where I am executing it. Stupid mistake.