Regarding to “/kernel: GENCFG: op 2 (USP Blob) failed; err 7 (Doesn’t Exist)”.
This kernel message is generated because kernel does not have a handler for a certain gencfg blob message.
It is harmless message and showing perhaps due to logging level too verbose.
You can modify your syslog level to ‘any critical’ to avoid these messages.
root@Firewall# set groups node1 system syslog file default-log-messages any ?
alert Conditions that should be corrected immediately
any All levels
critical Critical conditions
emergency Panic conditions
error Error conditions
info Informational messages
none No messages
notice Conditions that should be handled specially
warning Warning messages