cat it run in log4js-5.1.0 ? i got follow error

[gsons]

The "path" argument must be of type string. Received type undefined"

[adrian-e]

I had just the same problem! I had it related to webpack when trying to run the bundle.
I had to manually edit log4js/lib/appenders/index.js and add the following line

coreAppenders.set('@log4js-node/smtp', require('../../../@log4js-node/smtp/lib/index'));

After the last appender defined and it worked like a charm!