This issue has been fixed as of Privilege Manager 6.0.0(050). Upgrading to a version later than that will resolve the issue.
If unable to upgrade, the issue can also be resolved by lowering the file descriptor limit. The file descriptor limit can be set on a system wide level by modifying the rlim_fd_cur parameter the /etc/system file or a /etc/system.d file. It can also be set on a project level by setting the process.max-file-descriptor resource control via the projmod command. It can also be set per process using limit/ulimit/plimit commands.