OAI Error OJS 3.4

Our OAI Journal has a problem as shown in the picture, how to solve the OAI Error
https://khalifah.aksarashofa.com/index.php/khalifah/oai
![Cuplikan layar 2024-06-18 040153|690x467](upload://8pijkCTtN5V0lTXtQkFyUZEwOPr.png

https://prnt.sc/2949kXksMZsO
Image of the problem or capture a picture of the problem can be clicked on the link above