Error while validating the service descriptor 'ServiceType:

[agmohamed]

I implement JwtService from IJwtService at the Infrastructure layer
IJwtService declare at the Application layer

and
I implement IdentityService from IIdentityService at the Infrastructure layer
IJwtService declare at the Application layer

I register both at infrastructure dependency injection like

services.AddTransient< IJwtService,JwtService>();
services.AddTransient<IIdentityService,IdentityService>();

Then I implement LoginQueryHandler implement from : IRequestHandler<LoginViewModel, LoginDto>
within LoginQueryHandler() i inject IIdentityService and IJwtService

using mediator I send a request to LoginQuery Handler

   ```

public async Task Login([FromBody] LoginViewModel model)
{

        return await Mediator.Send(model);
      }

This is LoginQueryHandler Class

public class LoginViewModel : IRequest
{
public string Email { get; set; }
public string Password { get; set; }
// public string? Token { get; set; }

}
public class LoginQueryHandler : IRequestHandler<LoginViewModel, LoginDto>
{

private readonly IIdentityService _identityService;
private readonly IJwtService _jwtService;
public LoginQueryHandler(IIdentityService identityService,IJwtService jwtService)
{
    _identityService=identityService;
    _jwtService=jwtService;
    
}
public async Task<LoginDto> Handle(LoginViewModel request, CancellationToken cancellationToken)
{
    try
    {
        var user = await _identityService.FindByEmailAsync(request.Email);
       // codes....
        return new LoginDto();
    }
    catch (Exception ex)
    {
        throw ex;
    }
   
}

}

but it throws the following error

System.InvalidOperationException: Error while validating the service descriptor 'ServiceType: MediatR.IRequestHandler`2[Application.Login.Queries.LoginViewModel,Application.Login.Queries.LoginDto] Lifetime: Transient ImplementationType: Application.Login.Queries.LoginQueryHandler': Unable to resolve service for type 'TechneTravel.Infrastructure.Services.JwtService' while attempting to activate 'TechneTravel.Infrastructure.Identity.IdentityService'.
---> System.InvalidOperationException: Unable to resolve service for type 'TechneTravel.Infrastructure.Services.JwtService' while attempting to activate 'TechneTravel.Infrastructure.Identity.IdentityService'.

[suicodave]

Have you tried reordering them like IdentityService then JwtService?