Error: No valid external logger object found. Turning off external logger flag.

[apnrwebmanufact]

at Object.exports.LoggerException (/../node_modules/cybersource-rest-client/src/authentication/util/ApiException.js:18:15)
at LogConfiguration.getDefaultLoggingProperties (/../node_modules/cybersource-rest client/src/authentication/logging/LogConfiguration.js:134:26)

What is external logger, i didn't find doc about external logger