[Koha] koha updating database

Tue Feb 27 00:48:57 NZDT 2024

Hello!
How to fix this error?

21.05 to 23.05

Update errors :

   - Upgrade to 21.12.00.013 [10:55:03]: Bug 29605 - Resync DB structure
   for existing installations
   ERROR: {UNKNOWN}: DBI Exception: DBD::mysql::db do failed: Duplicate
   entry 'ar' for key 'PRIMARY' at /usr/share/koha/lib/C4/Installer.pm line 741

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J.Baatarsuren
Dean of libraries

Mongolian National University of Education
<https://www.facebook.com/mubislibrary>
Улаанбаатар хот, Сүхбаатар дүүрэг
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Web: http://monkoha.com/ <http://library.mnue.mn/>