UrBackup Server jail qnap error: ERROR: Error opening /dev/urandom for secure random number

hi guys

I am trying to run urbackup server in a chroot, but getting the following error… host env is qnap NAS, and the jail is an ubuntu precise server

The error being reported in /var/log/urbackup.log is as follows:

2017-01-02 07:42:35: ERROR: Error opening /dev/urandom for secure random number

Please advise.

Thanks
Soteri