[Koha] Checkin error

Hi to all. I am using koha 19.05 on Debian 9. When i try to checkin an item i am facing this error , Software error: DBIx::Class::Storage::DBI::_dbh_execute(): The user specified as a definer ('root'@'%') does not exist at /usr/share/koha/lib/Koha/Object.pm line 155 How to solve this problem? -- Best Regards *Muhammad Arshad Iqbal* *Assistant Librarian* *NUST Central Library * *National University of Science and Technology (NUST)* *Sector H-12, Islamabad, Pakistan* *Tel. Office:051-90851087* *Cell no.+923444900809* * +923004900159*