in databaseconnection.cs (GameServer)
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Code:
MySqlConnection C = null;
Then replace that whole code with this
Code:
MySqlConnection C = null;
try
{
C = new MySqlConnection("Server=" + SERVER + ";Database='" + DATA_BASE + "';Username='" + USER_NAME + "';Password='" + PASSWORD + "'");
C.Open();
}
I made a guide on it

Check my first link in sig