[Koha] Holds option is not working

Dear All, I am using koha 3.00.05 vesion (installed through koha live CD) Holds option is not working in Administrator Interface. It shows below mentioned error. Pl assist me for resolving the same. Gateway Time-out The gateway did not receive a timely response from the upstream server or application. ------------------------------ Apache/2.2.12 (Ubuntu) Server at localhost Port 8080 REgards Arun