internal/validators.js:112
throw new ERR_INVALID_ARG_TYPE(name, 'string', value);
^

TypeError [ERR_INVALID_ARG_TYPE]: The "path" argument must be of type string. Received type undefined
at validateString (internal/validators.js:112:11)
at Object.dirname (path.js:583:5)
at loadAppenderModule (webpack://zmlearn/./dist/dev/node_modules/log4js/lib/appenders/index.js?:41:81)
at createAppender (webpack://zmlearn/./dist/dev/node_modules/log4js/lib/appenders/index.js?:63:29)
at getAppender (webpack://zmlearn/./dist/dev/node_modules/log4js/lib/appenders/index.js?:54:20)
at eval (webpack://zmlearn/./dist/dev/node_modules/log4js/lib/appenders/index.js?:100:7)
at Array.forEach ()
at setup (webpack://zmlearn/./dist/dev/node_modules/log4js/lib/appenders/index.js?:96:33)
at eval (webpack://zmlearn/./dist/dev/node_modules/log4js/lib/configuration.js?:46:33)
at Array.forEach ()