fix nil pointer error

main.go

@@ -57,12 +57,14 @@ type LoggersConfig struct {
 	Appenders  map[string]LogAppenderConfig `json:"appenders"`
 	Categories map[string]LogConfig         `json:"categories"`
 }
+
 // Logger represents a logger instance for a specific category.
 // It maintains the log level and appenders for that category.
 // Example:
-//  logger := GetLogger("mycategory")
-//  logger.Info("This is an info message")
-//  logger.Error("This is an error message")
+//
+//	logger := GetLogger("mycategory")
+//	logger.Info("This is an info message")
+//	logger.Error("This is an error message")
 type Logger struct {
 	category  string
 	level     int
@@ -203,4 +205,5 @@ func RegistAppender(typeName string, appenderCreatCb func(LogAppenderConfig) *Lo
 
 func init() {
 	loggerMap["default"] = defaultLogger
+	appenders["console"] = &consoleAppender
 }