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I'm getting an exception when interacting with an installed local app addin:

      An unhandled exception has occurred while executing the request.
      System.ArgumentException: Value cannot be null or an empty string. (Parameter 'value')
         at NuGet.Versioning.NuGetVersion.Parse(String value)
         at Dynamicweb.Marketplace.MarketplaceService.<>c__DisplayClass7_0.<GetDependency>b__0(AddinProvider m)
         at Dynamicweb.Marketplace.MarketplaceService.Sync[T](Func`2 func, String manager)
         at Dynamicweb.Marketplace.MarketplaceService.GetDependency(String package, String manager, String version)
         at Dynamicweb.Marketplace.MarketplaceService.GetDependencies(String package, String provider, String version)
         at Dynamicweb.Content.UI.Queries.AddinDependenciesQuery.GetModel()
         at Dynamicweb.CoreUI.Screens.ScreenBuilders.ListScreenBuilder`3.GetScreenModel(DataQueryModelBase`1 query)
         at Dynamicweb.CoreUI.Screens.ScreenBuilders.ListScreenBuilder`3.Make()
         at Dynamicweb.CoreUI.Screens.ScreenBuilder.MakeScreen(BuildRequest request)
         at Dynamicweb.Management.UI.Controllers.AdminController.GetScreenFromDefinition(String screenDefinition, String shadowEditId)
         at Dynamicweb.Management.UI.Controllers.AdminController.GetLayoutDefinition(String screenDefinition, String shadowEditId)
         at Dynamicweb.Management.UI.Controllers.AdminController.GetScreen(String layout, String navigationPath, String shadowEditId)
         at Dynamicweb.Management.UI.Controllers.AdminController.GetUI()
         at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.TaskOfIActionResultExecutor.Execute(ActionContext actionContext, IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)
         at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeActionMethodAsync>g__Awaited|12_0(ControllerActionInvoker invoker, ValueTask`1 actionResultValueTask)
         at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeNextActionFilterAsync>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.InvokeInnerFilterAsync()
      --- End of stack trace from previous location ---
         at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeNextResourceFilter>g__Awaited|25_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
         at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ResourceExecutedContextSealed context)
         at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
         at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeFilterPipelineAsync()
      --- End of stack trace from previous location ---
         at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
         at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
         at Microsoft.AspNetCore.Routing.EndpointMiddleware.<Invoke>g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger)
         at Dynamicweb.Management.UI.Middleware.AdminUIRedirectMiddleware.Invoke(HttpContext context)
         at Dynamicweb.Management.UI.Middleware.AdminDiagnosticsMiddleware.Invoke(HttpContext context)
         at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
         at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
         at Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddlewareImpl.<Invoke>g__Awaited|8_0(ExceptionHandlerMiddlewareImpl middleware, HttpContext context, Task task)

It happens when I select the app from "Installed apps" in Appstore admin UI. I had no problems installing the app. It's complaining about NugetVersion so there is my csproj file:

I tried some different stuff but ended up copying the csproj from you OdataProvider on github and adjusting to my test app and building out a nupkg that I put in the Files/System/Addins/Local directory.