[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 converted above files xls to mrc file using mark editor and staged and uploaded successfully. Regards, Asif Iqbal Additional Director IT (Operations) BUITEMS, Takatu Campus, Quetta Phone: +92 81-2880511 (Ext: 555) Mobile: +92 3083999909 E-mail: asif.iqbal@buitms.edu.pk<mailto:asif.iqbal@buitms.edu.pk>