关于beego session redis报错的问题

func main(){
   sessionConfig := &session.ManagerConfig{
		CookieName :"gocsessionid",
		EnableSetCookie : true,
		Gclifetime : 3600,
		Maxlifetime : 3600,
		Secure : false,
		CookieLifeTime : 3600,
		ProviderConfig :"127.0.0.1:6379,root",
	}
	gloabalSessions, _ = session.NewManager("redis",sessionConfig)
	go gloabalSessions.GC()
}

提示错误

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x13b32a6]

goroutine 6 [running]:
github.com/astaxie/beego/session.(*Manager).GC(0x0)

在import  中添加 Redis

import(_"github.com/astaxie/beego/session/redis")