What does the "Type cannot be null" mean in the context of the IllegalArgumentException?

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The "Type cannot be null" message in the context of the IllegalArgumentException typically means that an argument or parameter in a method call is expected to have a certain data type, but the value passed for that parameter is null. This exception is thrown to indicate that the method cannot proceed with execution because an essential piece of information is missing. Therefore, the programmer needs to ensure that every parameter passed to the method is not null, and that they have the right data type.