Check the docs before asking a question: https://docs.abp.io/en/commercial/latest/ Check the samples to see the basic tasks: https://docs.abp.io/en/commercial/latest/samples/index The exact solution to your question may have been answered before, and please first use the search on the homepage. Provide us with the following info:

• ABP Framework version: v7.4.0
• UI Type: MVC
• Database System: EF Core (SQL Server)
• Tiered (for MVC) or Auth Server Separated (for Angular): no
• Exception message and full stack trace:
• System.TypeLoadException: Could not load type 'Microsoft.IdentityModel.Json.Linq.JObject' from assembly 'Microsoft.IdentityModel.Tokens, Version=7.0.3.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'. at Microsoft.IdentityModel.JsonWebTokens.JsonWebTokenHandler.CreateToken(SecurityTokenDescriptor tokenDescriptor) at OpenIddict.Server.OpenIddictServerHandlers.Protection.GenerateIdentityModelToken.HandleAsync(GenerateTokenContext context) at OpenIddict.Server.OpenIddictServerDispatcher.DispatchAsync[TContext](TContext context) at OpenIddict.Server.OpenIddictServerDispatcher.DispatchAsync[TContext](TContext context) at OpenIddict.Server.OpenIddictServerHandlers.GenerateAccessToken.HandleAsync(ProcessSignInContext context) at OpenIddict.Server.OpenIddictServerDispatcher.DispatchAsync[TContext](TContext context) at OpenIddict.Server.OpenIddictServerDispatcher.DispatchAsync[TContext](TContext context) at OpenIddict.Server.AspNetCore.OpenIddictServerAspNetCoreHandler.SignInAsync(ClaimsPrincipal user, AuthenticationProperties properties) at Microsoft.AspNetCore.Authentication.AuthenticationService.SignInAsync(HttpContext context, String scheme, ClaimsPrincipal principal, AuthenticationProperties properties) at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.g__Awaited|30_0[TFilter,TFilterAsync](ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted) at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ResultExecutedContextSealed context) at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.ResultNext[TFilter,TFilterAsync](State& next, Scope& scope, Object& state, Boolean& isCompleted) at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.g__Awaited|28_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted) at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.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.g__Awaited|20_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted) at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.g__Logged|17_1(ResourceInvoker invoker) at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.g__Logged|17_1(ResourceInvoker invoker) at Microsoft.AspNetCore.Routing.EndpointMiddleware.g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger) at Volo.Abp.AspNetCore.Serilog.AbpSerilogMiddleware.InvokeAsync(HttpContext context, RequestDelegate next) at Microsoft.AspNetCore.Builder.UseMiddlewareExtensions.<>c__DisplayClass6_1.<b__1>d.MoveNext() --- End of stack trace from previous location --- at Volo.Abp.AspNetCore.Auditing.AbpAuditingMiddleware.InvokeAsync(HttpContext context, RequestDelegate next) at Volo.Abp.AspNetCore.Auditing.AbpAuditingMiddleware.InvokeAsync(HttpContext context, RequestDelegate next) at Microsoft.AspNetCore.Builder.UseMiddlewareExtensions.<>c__DisplayClass6_1.<b__1>d.MoveNext() --- End of stack trace from previous location --- at Swashbuckle.AspNetCore.SwaggerUI.SwaggerUIMiddleware.Invoke(HttpContext httpContext) at Swashbuckle.AspNetCore.Swagger.SwaggerMiddleware.Invoke(HttpContext httpContext, ISwaggerProvider swaggerProvider) at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context) at Volo.Abp.AspNetCore.Uow.AbpUnitOfWorkMiddleware.InvokeAsync(HttpContext context, RequestDelegate next) at Microsoft.AspNetCore.Builder.UseMiddlewareExtensions.<>c__DisplayClass6_1.<b__1>d.MoveNext() --- End of stack trace from previous location --- at Volo.Abp.AspNetCore.ExceptionHandling.AbpExceptionHandlingMiddleware.InvokeAsync(HttpContext context, RequestDelegate next) at Volo.Abp.AspNetCore.ExceptionHandling.AbpExceptionHandlingMiddleware.InvokeAsync(HttpContext context, RequestDelegate next) at Microsoft.AspNetCore.Builder.UseMiddlewareExtensions.<>c__DisplayClass6_1.<b__1>d.MoveNext() --- End of stack trace from previous location --- at Volo.Abp.AspNetCore.MultiTenancy.MultiTenancyMiddleware.InvokeAsync(HttpContext context, RequestDelegate next) at Microsoft.AspNetCore.Builder.UseMiddlewareExtensions.<>c__DisplayClass6_1.<b__1>d.MoveNext() --- End of stack trace from previous location --- at Microsoft.AspNetCore.Builder.ApplicationBuilderAbpOpenIddictMiddlewareExtension.<>c__DisplayClass0_0.<b__0>d.MoveNext() --- End of stack trace from previous location --- at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context) at Volo.Abp.AspNetCore.Security.AbpSecurityHeadersMiddleware.InvokeAsync(HttpContext context, RequestDelegate next) at Microsoft.AspNetCore.Builder.UseMiddlewareExtensions.<>c__DisplayClass6_1.<b__1>d.MoveNext() --- End of stack trace from previous location --- at Volo.Abp.AspNetCore.Tracing.AbpCorrelationIdMiddleware.InvokeAsync(HttpContext context, RequestDelegate next) at Microsoft.AspNetCore.Builder.UseMiddlewareExtensions.<>c__DisplayClass6_1.<b__1>d.MoveNext() --- End of stack trace from previous location --- at Microsoft.AspNetCore.Localization.RequestLocalizationMiddleware.Invoke(HttpContext context) at Microsoft.AspNetCore.RequestLocalization.AbpRequestLocalizationMiddleware.InvokeAsync(HttpContext context, RequestDelegate next) at Microsoft.AspNetCore.Builder.UseMiddlewareExtensions.<>c__DisplayClass6_1.<b__1>d.MoveNext() --- End of stack trace from previous location --- at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddlewareImpl.Invoke(HttpContext context)

HEADERS

Accept: application/json Content-Length: 76 Content-Type: application/x-www-form-urlencoded Host: localhost:44353 X-Correlation-Id: 3ef13d343ac3401f96b3afedae59a4dd

• Steps to reproduce the issue:

I have a test application that retrieves a token from the server using client_credentials grant.

Whenevet I post using the following code, I get the above error message back

• Could not load type 'Microsoft.IdentityModel.Json.Linq.JObject' from assembly 'Microsoft.IdentityModel.Tokens

client.BaseAddress = new Uri(baseUrl); client.DefaultRequestHeaders.Accept.Clear(); client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json")); List&lt;KeyValuePair<string, string>> postData = new List&lt;KeyValuePair<string, string>>(); postData.Add(new KeyValuePair&lt;string, string>("grant_type", "client_credentials")); postData.Add(new KeyValuePair&lt;string, string>("client_id", clientId)); postData.Add(new KeyValuePair&lt;string, string>("client_secret", clientSecret)); FormUrlEncodedContent content = new FormUrlEncodedContent(postData); HttpResponseMessage response = await client.PostAsync("connect/token", content);