What is the nature of this error and what does it signify in the KM-ASSYH4-04 communication system of the Siemens machine?

What possible causes could lead to this error and how can it be diagnosed and resolved?

What is the likelihood of this error occurring and
The problem with Rear section-M7091-TE communication abnormality could be resolved by inspecting and checking the connections, wiring, or hardware components in the rear section of the transmission electronics (TE). Updating the