The Invalid Data Type error is issued in the following situations:
Incompatible data types in <operator> operator: you have data types that are not compatible with the operator being used.
Check the allowed data types for that operator and use a compatible data type.
<data type> data type required instead of <data type>: you have the wrong data type in a property or in the operator being used.
Check the allowed data types for the property or operator and use a compatible data type.
Invalid 'Null Value' data type for specified variable: you have specified an invalid null value for a variable.
Cannot send a 'Binary Data' parameter in the request '<send in>' of a method with '<request format>' request format. Change the parameter data type or the method request format.: in a REST API method, the request format does not allow sending binary data in the place that is set for the parameter.
Available Data Types | About Error Messages