What does the error "Uncaught TypeError: Cannot add property 0, object is not extensible at Array.push" mean?

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The error "Uncaught TypeError: Cannot add property 0, object is not extensible at Array.push" means that you are trying to add a new element to an array using the Array.push() method, but the array is not extensible. This typically occurs when the array has been defined with Object.freeze(), which prevents any modifications to the array. As a result, you cannot add any new elements to the array, and you will receive a TypeError when you try to do so.