ABP Suite - Error with loading entities after upgrading to 8.3.3 #8299

Provide us with the following info: 🧐 Hint: If you are using the ABP Studio, you can see all the information about your solution from the configuration window, which opens when you right-click on the solution and click on the Solution Configuration button.

• ABP Framework version: 8.3.3
• UI Type: MVC - Razor
• Database System: EF Core / SQL Server
• Tiered (for MVC) or Auth Server Separated (for Angular): no
• Exception message and full stack trace:

Error getting value from 'DefaultNamespace' on 'Volo.Abp.Suite.Models.Solution'. Newtonsoft.Json.JsonSerializationException: Error getting value from 'DefaultNamespace' on 'Volo.Abp.Suite.Models.Solution'. ---> System.ArgumentNullException: Value cannot be null. (Parameter 'path') at System.ArgumentNullException.Throw(String paramName) at System.IO.Directory.InternalEnumeratePaths(String path, String searchPattern, SearchTarget searchTarget, EnumerationOptions options) at System.IO.Directory.GetFiles(String path, String searchPattern, EnumerationOptions enumerationOptions) at Volo.Abp.Suite.Models.Solution.get_DefaultNamespace() at Newtonsoft.Json.Serialization.ExpressionValueProvider.GetValue(Object target) --- End of inner exception stack trace --- at Newtonsoft.Json.Serialization.ExpressionValueProvider.GetValue(Object target) at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.CalculatePropertyValues(JsonWriter writer, Object value, JsonContainerContract contract, JsonProperty member, JsonProperty property, JsonContract& memberContract, Object& memberValue) at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeObject(JsonWriter writer, Object value, JsonObjectContract contract, JsonProperty member, JsonContainerContract collectionContract, JsonProperty containerProperty) at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeList(JsonWriter writer, IEnumerable values, JsonArrayContract contract, JsonProperty member, JsonContainerContract collectionContract, JsonProperty containerProperty) at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeValue(JsonWriter writer, Object value, JsonContract valueContract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerProperty) at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeObject(JsonWriter writer, Object value, JsonObjectContract contract, JsonProperty member, JsonContainerContract collectionContract, JsonProperty containerProperty) at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeValue(JsonWriter writer, Object value, JsonContract valueContract, JsonProperty member, JsonContainerContract containerContract, JsonProperty containerProperty) at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.Serialize(JsonWriter jsonWriter, Object value, Type objectType) at Newtonsoft.Json.JsonSerializer.SerializeInternal(JsonWriter jsonWriter, Object value, Type objectType) at Newtonsoft.Json.JsonSerializer.Serialize(JsonWriter jsonWriter, Object value, Type objectType) at Newtonsoft.Json.JsonConvert.SerializeObjectInternal(Object value, Type type, JsonSerializer jsonSerializer) at Newtonsoft.Json.JsonConvert.SerializeObject(Object value, Type type, Formatting formatting, JsonSerializerSettings settings) at Newtonsoft.Json.JsonConvert.SerializeObject(Object value, Formatting formatting, JsonSerializerSettings settings) at Newtonsoft.Json.JsonConvert.SerializeObject(Object value, Formatting formatting) at Volo.Abp.Suite.Areas.AbpSuite.CrudPageGenerator.Helpers.IoHelper.WriteObjectToFileAsync[T](String filePath, T obj, Formatting serializeFormat) at Volo.Abp.Suite.Services.PersistanceService.SaveAppSettingsAsync(AppSettings appSettings) at Volo.Abp.Suite.Services.PersistanceService.Ppwpt1otcN(AddSolutionInput ) at Volo.Abp.Suite.Services.PersistanceService.AddSolutionAsync(AddSolutionInput input) at Volo.Abp.Suite.Controllers.AbpSuiteController.AddSolutionAsync(AddSolutionInput input) at lambda_method1840(Closure, Object) at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.AwaitableObjectResultExecutor.Execute(ActionContext actionContext, IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments) at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.g__Awaited|12_0(ControllerActionInvoker invoker, ValueTask`1 actionResultValueTask) at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.g__Awaited|10_0(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted) at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Rethrow(ActionExecutedContextSealed context) at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted) at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.g__Awaited|13_0(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted) at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.g__Awaited|26_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)

• Steps to reproduce the issue:

Hi, I upgraded a solution created on 7.x to 8.3.3 following the steps in the version migration guides. Now it works properly both locally and on the server. I upgraded abp cli and studio to their latest versions too. Now when I tried to open the solution in suite, the entities can not be loaded and an error occurs as in the image. It behaves similar in ABP Studio too. The problem started after upgrade that I edited these entities many times through suite before.

I checked "DefaultNamespace" as the error log says for this project in .abp/suite/appsettings.json, it's there and correct.

Would be pleased if you could help me with this problem, Thank you.