Hello I am trying to deploy my go application, but I keep getting this server error: Application failed to respond

err := godotenv.Load()
if err != nil {
panic(err)
}

server := gin.Default()

port := os.Getenv("PORT")

if port == "" {
    port = "8080"
}

[server.Run](server.Run)("0.0.0.0:" + port)

/* .env file */
PORT=8080
I am not sure what to do at this point. thank you for your help. I didn't do any build commands on railway. I just used the default. thank you