Cause: There is an OS limit on the number of threads per user which is being exceeded.
Resolution
Either change the max processors per user from 1024 to 2048 (ulimit -u / 'nproc' in the /etc/security/limits.conf file) or set nproc (number of processes allowed by that user) via limits.conf as an alternative way to set resource limits. Users can also set this via ulimit –u <2048>, which is the same as setting it via limits.conf, but the user has to do it in every shell instance.