Okuma Alarm-C 3684 MCS Rotary encoder 5 error

Okuma Alarm-C 3684 MCS Rotary encoder 5 error
Illegal data was detected in Rotary encoder 5(Others).

Object
Axis

Character-string
None

Probable Faulty Locations
Rotary encoder 5(Others).

Corrective Action
Change Rotary encoder 5(Others).