[Koha] problem in opac error 500

Dear, I am facing a problem using koha for my university in opac i am facing the error when i search a book but in staff environment its giveing me proper book details but in OPAC giving me error 500. i uploaded book record using mark record and following fields are included only not i have conv

Re: [Koha] Email for suggestion book

Yesterday, one of my patrons thanked me for the availability of the book he suggested. He got an email from the library. That meant the system worked again. Well, I did nothing for this. *Toni Afandi* *Librarian* *STT SAAT* *(Southeast Asia Bible Seminary)* Jl. Bukit Hermon No 1, Tidar Atas Mal