What if I'm not using any external libraries? Can this error still occur?

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Grade: Education Subject: Support
What if I'm not using any external libraries? Can this error still occur?
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Yes, it can. If you've accidentally assigned an object to a variable that you intended to be a function, or if you're calling a property of an object as if it were a function, you'll get this error even without external libraries. Carefully review your code for any such mistakes.