Error 37000

XM029: Free-text expression, line 0: Invalid character in free-text search expression, it may not appear outside quoted string at %

in
EXEC:(BIF),
        __01 => 'SPARQL 
    PREFIX oplfeat: <http://www.openlinksw.com/ontology/features#>
    PREFIX oplprod: <ht' (truncated),
        __02 => NULL,
        __03 => NULL,
        __04 => NULL,
        __05 => 0,
        __06 => 0,
        __07 => 0,
WS.WS./DAV/oplweb3/uda/content/drivers-new.vsp:303,
        path => (ARRAY_OF_POINTER value, tag 193),
      params => (ARRAY_OF_POINTER value, tag 193),
       lines => (ARRAY_OF_POINTER value, tag 193),
signal:(BIF),
        __01 => '37000',
        __02 => 'XM029: Free-text expression, line 0: Invalid character in free-text search expression, it may not ap' (truncated),
WS.WS.GET([executable]/dav.sql:2969),
        path => (ARRAY_OF_POINTER value, tag 193),
      params => (ARRAY_OF_POINTER value, tag 193),
       lines => (ARRAY_OF_POINTER value, tag 193)