Unable to launch the application

Hi Expert,
I am getting below mentioned eror while launching IIS
An error occurred while starting the application.
ArgumentNullException: Value cannot be null.
Parameter name: certificate
Microsoft.IdentityModel.Tokens.X509SecurityKey…ctor(X509Certificate2 certificate)

IdentityException: Could not load the signing certificate(s)
mdf.Identity.Api.Helpers.ServiceCollectionExtensions.AddmdfIdentityServer(IServiceCollection services, IHostingEnvironment env) in ServiceCollectionExtensions.cs, line 156

ArgumentNullException: Value cannot be null. Parameter name: certificate
Microsoft.IdentityModel.Tokens.X509SecurityKey…ctor(X509Certificate2 certificate)
mdf.Identity.Api.Helpers.ServiceCollectionExtensions+<>c__DisplayClass4_1.b__7(string x) in ServiceCollectionExtensions.cs
System.Linq.Enumerable+SelectArrayIterator<TSource, TResult>.MoveNext()
System.Collections.Generic.LargeArrayBuilder.AddRange(IEnumerable items)
System.Collections.Generic.EnumerableHelpers.ToArray(IEnumerable source)
System.Linq.Enumerable.ToArray(IEnumerable source)
mdf.Identity.Api.Helpers.ServiceCollectionExtensions.AddmdfIdentityServer(IServiceCollection services, IHostingEnvironment env) in ServiceCollectionExtensions.cs

Show raw exception details
IdentityException: Could not load the signing certificate(s)
mdf.Identity.Api.Helpers.ServiceCollectionExtensions.AddmdfIdentityServer(IServiceCollection services, IHostingEnvironment env) in ServiceCollectionExtensions.cs
mdf.Identity.Api.Startup.ConfigureServices(IServiceCollection services) in Startup.cs
Microsoft.AspNetCore.Hosting.ConventionBasedStartup.ConfigureServices(IServiceCollection services)
Microsoft.AspNetCore.Hosting.Internal.WebHost.EnsureApplicationServices()
Microsoft.AspNetCore.Hosting.Internal.WebHost.Initialize()
Microsoft.AspNetCore.Hosting.Internal.WebHost.BuildApplication()

Show raw exception details
.NET Core 4.6.28008.01 X64 v4.0.0.0 | Microsoft.AspNetCore.Hosting version 2.1.1-rtm-30846 | Microsoft Windows 6.3.9600 | Need help?

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