[#5655] - Is param1 of 'Input Control' $X{IN, param1, param2} must be a string ?

I tried to create multi-select query in ireport before uploading to jasperserver repository.
<parameter name="CountryList" class="java.util.Collection"/>
<queryString><![CDATA[
SELECT * FROM Orders WHERE $X{IN, ShipCountryID, CountryList}
]]></queryString>

Running the report generated an error. ie.
Caused by: org.postgresql.util.PSQLException: ERROR: operator does not exist: integer = character varying
Hint: No operator matches the given name and argument type(s). You might need to add explicit type casts.

ShipCountryID is a integer.