XPS.dll error on a LJ 4350tn

Hello everyone first time posting
I searched the forum and did not see anything pertinent so I am starting a new thread. I apologize in advance if I missed this somewhere else.

I have a HP LJ 4350 TN that had an odd error code today.
the display listed as follows:

STVL10 004aec6c
XPS.DLL

I restarted the printer and all is well, but I am curious as to what this may mean. Is it that any xps formatted documents are not printing according to the formatting? Any ideas would be appreciated.
TY