Upgrade IdentityServer4 from 2.2 to 3.1 error

Question

I am updating IdentityServer4 from 2.2 to 3.1, I cannot run pass app.UseEndpoints. Here is the exception

Unable to load one or more of the requested types.\\r\\nCould not load type 'IdentityModel.Client.DiscoveryResponse' from assembly 'IdentityModel, Version=4.1.1.0, Culture=neutral, PublicKeyToken=e7877f4675df049f'

    public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
    {
        if (_environment.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
            app.UseDatabaseErrorPage();
        }
        try
        {
            using (var serviceScope = app.ApplicationServices.GetRequiredService<IServiceScopeFactory>().CreateScope())
            {
                SeedData.EnsureSeedData(serviceScope, Configuration);
            }
        }
        catch (Exception ex)
        {
            Debug.WriteLine(ex.Message);
        }

        //app.UseIdentityServer();
        //app.UseCors(builder => builder.AllowAnyOrigin().AllowAnyHeader().AllowAnyMethod().AllowCredentials());
        //app.UseStaticFiles();
        //app.UseMvcWithDefaultRoute();

        app.UseStaticFiles();

        app.UseRouting();
        app.UseCors();
        app.UseIdentityServer();
        // app.UseAuthorization();
        app.UseEndpoints(endpoints =>
        {
            endpoints.MapDefaultControllerRoute();
        });
    }

I did a search, found the following link. https://github.com/IdentityModel/IdentityModel/issues/245 But, I still cannot figure out the problem.

Answer 1

The problem was resolved. Here is the link for solution. https://github.com/IdentityServer/IdentityServer4/issues/3986