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The Java error message "Property response is not defined in type Error" means that there is an attempt to access a property named "response" in an object of type "Error," but no such property is defined in that type. This suggests that there is a mistake in the program's code, either in attempting to use an incorrect data type or in attempting to access a property that does not exist. The programmer will need to review the code and make appropriate corrections to ensure that the application can function correctly.