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invalid memory address or nil pointer dereference

When I try to do implement the logger class following the Udemy tutorial, I was running into two problems.

  1. The UnusedVar problem because the logger variable from here logger, err := config.Build(zap.AddCallerSkip(1)) was not doing anything else. I added this line to solve the problem defer logger.Sync().
  2. Now when I call the helper functions, I'm getting this error.

image

Here's my full logger implementation. Kindly assist.

package logger

import (
	"go.uber.org/zap"
	"go.uber.org/zap/zapcore"
)

var logger *zap.Logger

func init() {
	var err error
	config := zap.NewProductionConfig()
	encoderConfig := zap.NewProductionEncoderConfig()
	encoderConfig.TimeKey = "timestamp"
	encoderConfig.EncodeTime = zapcore.ISO8601TimeEncoder
	config.EncoderConfig = encoderConfig

	logger, err := config.Build(zap.AddCallerSkip(1))
	// _ = log

	// log, err := zap.NewProduction()
	if err != nil {
		panic(err)
	}

	defer logger.Sync()
	logger.Info("Hello Zap!")
	
	// log.Sync()
}

func Info(message string, fields ...zap.Field) {
	logger.Info(message, fields...)
}

func Debug(message string, fields ...zap.Field) {
	logger.Debug(message, fields...)
}

func Error(message string, fields ...zap.Field) {
	logger.Error(message, fields...)
}

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