Search notes:

ORA-17041: Missing IN or OUT parameter at index: …

On 19c, The following statement throws ORA-17041: Missing IN or OUT parameter at index: 1. In 23ai, the ORA-17041 part of the message is not thrown anymore. 
select
   *
from
   dual match_recognize (
      pattern (a b?)
   );

See also

Other Oracle error messages

Index