Your queries appear to be using the ADQL geometry functions (e.g. CIRCLE, POINT, etc). Unfortunately, these are not supported by our TAP service and are the cause of the error message. Note also that newer versions of TOPCAT use ADQL 2.1 as a default which can also lead to an error, be sure to select ADQL 2.0 as the query language in the tap service panel.
Please let us know if you continue to have problems.