Error 42000

Invalid character in decode_b32_num
in
signal:(BIF),
        __01 => '42000',
        __02 => 'Invalid character in decode_b32_num',
DB.DBA.decode_b32_num([executable]/system2.sql:740),
           s => 'CAFNI&OUTPUT=APPLICATION%2FATOM%2BXML',
WS.CURI.curi_string_to_uri:19,
  curi_string => '8CAFNI&output=application%2Fatom%2Bxml',
WS.CURI./DAV/VAD/c_uri/get.vsp:8,
        path => (ARRAY_OF_POINTER value, tag 193),
      params => (ARRAY_OF_POINTER value, tag 193),
       lines => (ARRAY_OF_POINTER value, tag 193),
signal:(BIF),
        __01 => '42000',
        __02 => 'Invalid character in decode_b32_num
in
signal:(BIF),
        __01 => '42000',
        __02 => 'Inval' (truncated),
WS.WS.GET([executable]/dav.sql:2959),
        path => (ARRAY_OF_POINTER value, tag 193),
      params => (ARRAY_OF_POINTER value, tag 193),
       lines => (ARRAY_OF_POINTER value, tag 193)