Ambiguous match found

[ClementeGao]

public class Test1Handler : BaseHander<Entity1>
{

}
public class Test2Handler : BaseHander<Entity2>
{

}

 public class BaseHander<TEntity>:IRequestHandler<UpdateSubmitCommand, Result>,
        IRequestHandler<DeleteCommand, Result>,
        IRequestHandler<UpdateRowStatusCommand, Result>
{
      public virtual async Task<Result> Handle(UpdateRowStatusCommand request, CancellationToken cancellationToken) =>throw new NotImplementedException()
      public virtual async Task<Result> Handle(UpdateSubmitCommand request, CancellationToken cancellationToken) =>throw new NotImplementedException()
      public virtual async Task<Result> Handle(DeleteCommand request, CancellationToken cancellationToken) =>throw new NotImplementedException()
} 

public class Startup
{
     public void ConfigureServices(IServiceCollection services)
       {
           services.AddMediatR(typeof(Startup).Assembly);
       }
}

when i setup program it have a error

System.Reflection.AmbiguousMatchException: Ambiguous match found.
at System.RuntimeType.GetInterface(String fullname, Boolean ignoreCase)
at System.Type.GetInterface(String name)
at MediatR.Registration.ServiceRegistrar.IsMatchingWithInterface(Type handlerType, Type handlerInterface) in D:\Clement\projects\sourcecodes\MediatR.Extensions.Microsoft.DependencyInjection-master\src\MediatR.Extensions.Microsoft.DependencyInjection\Registration\ServiceRegistrar.cs:line 126
at MediatR.Registration.ServiceRegistrar.<>c__DisplayClass1_0.b__3(Type m) in D:\Clement\projects\sourcecodes\MediatR.Extensions.Microsoft.DependencyInjection-master\src\MediatR.Extensions.Microsoft.DependencyInjection\Registration\ServiceRegistrar.cs:line 94
at System.Collections.Generic.List1.RemoveAll(Predicate1 match)
at MediatR.Registration.ServiceRegistrar.ConnectImplementationsToTypesClosing(Type openRequestInterface, IServiceCollection services, IEnumerable1 assembliesToScan, Boolean addIfAlreadyExists) in D:\Clement\projects\sourcecodes\MediatR.Extensions.Microsoft.DependencyInjection-master\src\MediatR.Extensions.Microsoft.DependencyInjection\Registration\ServiceRegistrar.cs:line 94 at MediatR.Registration.ServiceRegistrar.AddMediatRClasses(IServiceCollection services, IEnumerable1 assembliesToScan) in D:\Clement\projects\sourcecodes\MediatR.Extensions.Microsoft.DependencyInjection-master\src\MediatR.Extensions.Microsoft.DependencyInjection\Registration\ServiceRegistrar.cs:line 17
at MediatR.ServiceCollectionExtensions.AddMediatR(IServiceCollection services, IEnumerable1 assemblies, Action1 configuration) in D:\Clement\projects\sourcecodes\MediatR.Extensions.Microsoft.DependencyInjection-master\src\MediatR.Extensions.Microsoft.DependencyInjection\ServiceCollectionExtensions.cs:line 60
at MediatR.ServiceCollectionExtensions.AddMediatR(IServiceCollection services, Assembly[] assemblies) in D:\Clement\projects\sourcecodes\MediatR.Extensions.Microsoft.DependencyInjection-master\src\MediatR.Extensions.Microsoft.DependencyInjection\ServiceCollectionExtensions.cs:line 29
at SaleManage.ApiHost.Startup.ConfigureServices(IServiceCollection services) in D:\NX\projects\backEnd\dbn.microservices\SaleManagement\SaleManage\src\SaleManage.ApiHost\Startup.cs:line 187
at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor, Boolean wrapExceptions)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
at Microsoft.AspNetCore.Hosting.ConfigureServicesBuilder.InvokeCore(Object instance, IServiceCollection services)
at Microsoft.AspNetCore.Hosting.ConfigureServicesBuilder.<>c__DisplayClass9_0.g__Startup|0(IServiceCollection serviceCollection)
at Microsoft.AspNetCore.Hosting.ConfigureServicesBuilder.Invoke(Object instance, IServiceCollection services)
at Microsoft.AspNetCore.Hosting.ConfigureServicesBuilder.<>c__DisplayClass8_0.b__0(IServiceCollection services)
at Microsoft.AspNetCore.Hosting.GenericWebHostBuilder.UseStartup(Type startupType, HostBuilderContext context, IServiceCollection services, Object instance)
at Microsoft.AspNetCore.Hosting.GenericWebHostBuilder.<>c__DisplayClass13_0.b__0(HostBuilderContext context, IServiceCollection services)
at Microsoft.Extensions.Hosting.HostBuilder.CreateServiceProvider()
at Microsoft.Extensions.Hosting.HostBuilder.Build()

How can I change my code i need your help thank you