LinuxQuestions.org - NFSD: Unable to end grace period

I am running a Slackware64-14.1 in a virtual environment (VMware enterprise) with the primary function to provide shares via NFS.

At boot, every time, I see the following in dmesg

Code:

[ 12.650427] NFSD: starting 90-second grace period (net ffffffff820d2540)

[ 20.321526] hpet1: lost 6 rtc interrupts

[ 54.238127] hpet1: lost 5 rtc interrupts

[ 133.002126] NFSD: Unable to end grace period: -110

This is the server that exports the shares.

What does this error mean and how can I correct it?
Thank you.