[c-nsp] ERROR in strata_protected_notify:line987

[Octave]

Hi,
I have a strange error on a switch. I didn't find any information
about this kind of errors. IOS's bug ? Switch has died ? 

Thanks in advance
Octave

IOS (tm) C2950 Software (C2950-I6Q4L2-M), Version 12.1(22)EA1, RELEASE SOFTWARE (fc1)
WS-C2950G-24-EI

00:19:19: ERROR in strata_protected_notify:line987: can't get remote inst pointer
SCHAN ERROR INTR: unit=0 SRC=6 DST=5
                    OPCODE=20 ERRCODE=5
SCHAN ERROR INTR: unit=0 SRC=6 DST=5
                    OPCODE=20 ERRCODE=5
SCHAN ERROR INTR: unit=0 SRC=6 DST=5