The JavaScript exception "null (or undefined) has no properties" occurs when you attempt to access properties of null and undefined. They don't have any.

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The JavaScript exception "can't redefine non-configurable property" occurs when it was attempted to redefine a property, but that property is non-configurable.

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The JavaScript exception "return not in function" occurs when a return statement is called outside of a function.

The JavaScript exception "is not iterable" occurs when the value which is spread into an array or function call, given as the right-hand side of for...of, as argument of a function such as Promise.all or Set(), or as the right-hand side of an array destructuring assignment, is not an iterable object. This error is also encountered when Array.fromAsync() or for await...of is used with a non-async iterable.

The JavaScript exception "identifier starts immediately after numeric literal" occurs when an identifier started with a digit. Identifiers can only start with a letter, underscore (_), or dollar sign ($).

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The JavaScript exception "x can't be converted to BigInt" occurs when attempting to convert a Symbol, null, or undefined value to a BigInt, or if an operation expecting a BigInt parameter receives a number.

The JavaScript exception "more arguments needed" occurs when there is an error with how a function is called. More arguments need to be provided.