If the 'device 7B error' you refer to is to do with the Ecowitt Gateway Device driver providing a line similar to the following in the log:
DEBUG user.gw1000: Unknown field address '7B' detected. Remaining data '00' ignored.
then you can safely ignore it. Ecowitt included data in field 7B in an earlier firmware release but did not document this in then current API documentation, so consequently the driver did not know how to decode/interpret the data and it was logged and ignored. Ecowitt have subsequently documented field 7B (it is a flag for whether temperature compensation is applied or not - the API terms it 'radiation compensation') and it will be supported in the next driver release. Also, that log entry is at the debug level so it will only appear in the log once you set debug = 1.
Gary