Let's understand what it means by these code - ORA - XXXXX

Hi, just for your reference :

ORA-00942 table or view does not exist

TNS-12571 TNS:packet writer failure
Cause: An error occurred during a data send. This message is not normally
visible to the user.
In addition, this message could occur when any of the following SQL*Plus
commands have been issued:
n SHUTDOWN ABORT
n SHUTDOWN IMMEDIATE
n SHUTDOWN TRANSACTIONAL
Action: For further details, turn on tracing and re-execute the operation. If the
error persists, contact Oracle Support Services.