第一次打开et7，按照运行指南上走的，可以clientserver模式跑，但是不能单独运行服务器，单独运行的话，在点击demo的登录按钮之后会报错，测试是如果没有运行后端程序，就会说连接失败，如果开启了后端程序，就会报下面这些错

System.Exception: <!DOCTYPE HTML PUBLIC “-//W3C//DTD HTML 4.01//EN”“http://www.w3.org/TR/html4/strict.dtd”>
<HTML><HEAD><TITLE>Service Unavailable</TITLE>
<META HTTP-EQUIV=“Content-Type” Content=“text/html; charset=us-ascii”></HEAD>
<BODY><h2>Service Unavailable</h2>
<hr><p>HTTP Error 503. The service is unavailable.</p>
</BODY></HTML>

System.FormatException: Invalid JSON input ''.
at MongoDB.Bson.IO.JsonScanner.GetNextToken (MongoDB.Bson.IO.JsonBuffer buffer) [0×001b9] in <5ff69d2da4404fe989a6fb30abb5b06e>:0
at MongoDB.Bson.IO.JsonReader.PopToken () [0×00022] in <5ff69d2da4404fe989a6fb30abb5b06e>:0
at MongoDB.Bson.IO.JsonReader.ReadBsonType () [0×0012e] in <5ff69d2da4404fe989a6fb30abb5b06e>:0
at MongoDB.Bson.IO.BsonReader.GetCurrentBsonType () [0×00023] in <5ff69d2da4404fe989a6fb30abb5b06e>:0
at MongoDB.Bson.Serialization.BsonClassMapSerializer1[TClass].Deserialize (MongoDB.Bson.Serialization.BsonDeserializationContext context, MongoDB.Bson.Serialization.BsonDeserializationArgs args) [0x00044] in <5ff69d2da4404fe989a6fb30abb5b06e>:0 at MongoDB.Bson.Serialization.IBsonSerializerExtensions.Deserialize[TValue] (MongoDB.Bson.Serialization.IBsonSerializer1[TValue] serializer, MongoDB.Bson.Serialization.BsonDeserializationContext context) [0×00019] in <5ff69d2da4404fe989a6fb30abb5b06e>:0
at MongoDB.Bson.Serialization.BsonSerializer.Deserialize[TNominalType] (MongoDB.Bson.IO.IBsonReader bsonReader, System.Action1[T] configurator) [0x0000f] in <5ff69d2da4404fe989a6fb30abb5b06e>:0 at MongoDB.Bson.Serialization.BsonSerializer.Deserialize[TNominalType] (System.String json, System.Action1[T] configurator) [0×00009] in <5ff69d2da4404fe989a6fb30abb5b06e>:0
at ET.MongoHelper.FromJson[T] (System.String str) [0×00002] in D:\ET\Unity\Assets\Scripts\Core\Serialize\MongoHelper.cs:136
at ET.MongoHelper.FromJson[T] (System.String str) [0×0000e] in D:\ET\Unity\Assets\Scripts\Core\Serialize\MongoHelper.cs:140
at ET.JsonHelper.FromJson[T] (System.String json) [0×00001] in D:\ET\Unity\Assets\Scripts\Core\Serialize\JsonHelper.cs:19
at ET.Client.RouterAddressComponentSystem.GetAllRouter (ET.Client.RouterAddressComponent self) [0×000ee] in D:\ET\Unity\Assets\Scripts\Codes\Hotfix\Client\Demo\Router\RouterAddressComponentSystem.cs:32
at ET.ETTask.GetResult () [0×00039] in D:\ET\Unity\Assets\Scripts\ThirdParty\ETTask\ETTask.cs:126
at ET.Client.RouterAddressComponentSystem.Init (ET.Client.RouterAddressComponent self) [0×0003c] in D:\ET\Unity\Assets\Scripts\Codes\Hotfix\Client\Demo\Router\RouterAddressComponentSystem.cs:23
at ET.ETTask.GetResult () [0×00039] in D:\ET\Unity\Assets\Scripts\ThirdParty\ETTask\ETTask.cs:126
at ET.Client.LoginHelper.Login (ET.Scene clientScene, System.String account, System.String password) [0×000ab] in D:\ET\Unity\Assets\Scripts\Codes\Hotfix\Client\Demo\Login\LoginHelper.cs:20
UnityEngine.Debug:LogError (object)
ET.UnityLogger:Error (string) (at Assets/Scripts/Loader/UnityLogger.cs:29)
ET.Logger:Error (System.Exception) (at Assets/Scripts/Core/Module/Log/Logger.cs:94)
ET.Log:Error (System.Exception) (at Assets/Scripts/Core/Module/Log/Log.cs:39)
ET.Client.LoginHelper/<Login>d0:MoveNext () (at Assets/Scripts/Codes/Hotfix/Client/Demo/Login/LoginHelper.cs:45)
ET.ETTask:SetException (System.Exception) (at Assets/Scripts/ThirdParty/ETTask/ETTask.cs:161)
ET.ETAsyncTaskMethodBuilder:SetException (System.Exception) (at Assets/Scripts/ThirdParty/ETTask/AsyncETTaskMethodBuilder.cs:28)
ET.Client.RouterAddressComponentSystem/<Init>d1:MoveNext () (at Assets/Scripts/Codes/Hotfix/Client/Demo/Router/RouterAddressComponentSystem.cs:23)
ET.ETTask:SetException (System.Exception) (at Assets/Scripts/ThirdParty/ETTask/ETTask.cs:161)
ET.ETAsyncTaskMethodBuilder:SetException (System.Exception) (at Assets/Scripts/ThirdParty/ETTask/AsyncETTaskMethodBuilder.cs:28)
ET.Client.RouterAddressComponentSystem/<GetAllRouter>d2:MoveNext () (at Assets/Scripts/Codes/Hotfix/Client/Demo/Router/RouterAddressComponentSystem.cs:39)
ET.ETTask1<string>:SetResult (string) (at Assets/Scripts/ThirdParty/ETTask/ETTask.cs:295) ET.ETAsyncTaskMethodBuilder1<string>:SetResult (string) (at Assets/Scripts/ThirdParty/ETTask/AsyncETTaskMethodBuilder.cs:94)
ET.Client.HttpClientHelper/<Get>d0:MoveNext () (at Assets/Scripts/Codes/Hotfix/Client/Demo/Router/HttpClientHelper.cs:22)
System.Threading.Tasks.SynchronizationContextAwaitTaskContinuation/<>c:<.cctor>b7_0 (object)
ET.ThreadSynchronizationContext/<>cDisplayClass3_0:<Post>b__0 () (at Assets/Scripts/Core/ThreadSynchronizationContext.cs:36)
ET.ThreadSynchronizationContext:Update () (at Assets/Scripts/Core/ThreadSynchronizationContext.cs:25)
ET.MainThreadSynchronizationContext:Update () (at Assets/Scripts/Core/Module/Synchronization/MainThreadSynchronizationContext.cs:18)
ET.Game:Update () (at Assets/Scripts/Core/Singleton/Game.cs:82)
ET.Init:Update () (at Assets/Scripts/Loader/MonoBehaviour/Init.cs:42)