Unable to resolve service for type 'Microsoft.AspNet.Hosting.IHostingEnvironment' while attempting to activate 'cms.Controllers.PageController'.

So i'm trying to upload my images via a API to the folder and for that i need my environment which wouldn't work.

The error that i get:

Unable to resolve service for type 'Microsoft.AspNet.Hosting.IHostingEnvironment' while attempting to activate 'cms.Controllers.PageController'.

My code (it goes wrong when i put the iHostingEnviroment in the controller)

namespace cms.Controllers
{
    [Route("/api/[controller]")]
    public class PageController : Controller
    {
        ets1Context _context;
        UserManager<ApplicationUser> _userManager;
        private readonly IHostingEnvironment _env;

        public object PageResourceJson { get; private set; }


        public PageController(ets1Context context, UserManager<ApplicationUser> userManager, IHostingEnvironment env)
        {
            _context = context;
            _userManager = userManager;
            _env = env;
        }


        [Route("/api/image/[controller]")]
        [HttpPost]
        public IActionResult UploadFilesAjax()
        {
            long size = 0;
            var files = Request.Form.Files;
            foreach (var file in files)
            {
                var filename = ContentDispositionHeaderValue
                                .Parse(file.ContentDisposition)
                                .FileName
                                .Trim('"');
                filename = _env.WebRootPath + $@"\{filename}";
                size += file.Length;
                using (FileStream fs = System.IO.File.Create(filename))
                {
                    file.CopyTo(fs);
                    fs.Flush();
                }
            }

            return Ok();
        }
    }
}

My startup ( ther las time i got an ae:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Identity.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using cms.Data;
using cms.Models;
using cms.Services;
using cms.Entity;

namespace cms
{
    public class Startup
    {
        public Startup(IHostingEnvironment env)
        {
            var builder = new ConfigurationBuilder()
                .SetBasePath(env.ContentRootPath)
                .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
                .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true);

            if (env.IsDevelopment())
            {
                // For more details on using the user secret store see http://go.microsoft.com/fwlink/?LinkID=532709
                builder.AddUserSecrets();

                // This will push telemetry data through Application Insights pipeline faster, allowing you to view results immediately.
                builder.AddApplicationInsightsSettings(developerMode: true);
            }

            builder.AddEnvironmentVariables();
            Configuration = builder.Build();
        }

        public IConfigurationRoot Configuration { get; }

        //public void OnConfiguring(IServiceCollection services)
        //{
        //    services.AddMvc();

        //    var cs = Configuration.GetConnectionString("DatabaseCon");
        //    services.AddDbContext<ets1Context>(options => options.UseSqlServer(cs));
        //}

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            // Add framework services.
            services.AddApplicationInsightsTelemetry(Configuration);

            var cs = Configuration.GetConnectionString("DatabaseCon");
            services.AddDbContext<ApplicationDbContext>(options =>
                options.UseSqlServer(cs));

            services.AddIdentity<ApplicationUser, IdentityRole>()
                .AddEntityFrameworkStores<ApplicationDbContext>()
                .AddDefaultTokenProviders();

            services.AddDbContext<ets1Context>(options => options.UseSqlServer(cs));

            services.AddMvc();

            // Add application services.
            services.AddTransient<IEmailSender, AuthMessageSender>();
            services.AddTransient<ISmsSender, AuthMessageSender>();
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
        {
            loggerFactory.AddConsole(Configuration.GetSection("Logging"));
            loggerFactory.AddDebug();

            app.UseApplicationInsightsRequestTelemetry();

            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
                app.UseDatabaseErrorPage();
                app.UseBrowserLink();
            }
            else
            {
                app.UseExceptionHandler("/Home/Error");
            }

            app.UseApplicationInsightsExceptionTelemetry();

            app.UseStaticFiles();

            app.UseIdentity();

            // Add external authentication middleware below. To configure them please see http://go.microsoft.com/fwlink/?LinkID=532715

            app.UseMvc(routes =>
            {
                routes.MapRoute(
                    name: "default",
                    template: "{controller=Account}/{action=Login}/{id?}");
            });
        }
    }
}

And my project.json:

{"buildOptions": {"emitEntryPoint": true,"preserveCompilationContext": true
  },"dependencies": {"Microsoft.ApplicationInsights.AspNetCore": "1.0.0","Microsoft.AspNet.Http.Extensions": "1.0.0-rc1-final","Microsoft.AspNet.Mvc.Core": "6.0.0-rc1-final","Microsoft.AspNetCore.Authentication.Cookies": "1.0.0","Microsoft.AspNetCore.Diagnostics": "1.0.0","Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore": "1.0.0","Microsoft.AspNetCore.Identity.EntityFrameworkCore": "1.0.0","Microsoft.AspNetCore.Mvc": "1.0.1","Microsoft.AspNetCore.Mvc.Core": "1.0.1","Microsoft.AspNetCore.Razor.Tools": {"version": "1.0.0-preview2-final","type": "build"
    },"Microsoft.AspNetCore.Routing": "1.0.1","Microsoft.AspNetCore.Server.IISIntegration": "1.0.0","Microsoft.AspNetCore.Server.Kestrel": "1.0.1","Microsoft.AspNetCore.StaticFiles": "1.0.0","Microsoft.EntityFrameworkCore": "1.1.0","Microsoft.EntityFrameworkCore.Design": "1.1.0","Microsoft.EntityFrameworkCore.Sqlite": "1.0.0","Microsoft.EntityFrameworkCore.Sqlite.Design": "1.0.0","Microsoft.EntityFrameworkCore.SqlServer.Design": "1.1.0","Microsoft.EntityFrameworkCore.Tools": "1.1.0-preview4-final","Microsoft.Extensions.Configuration.EnvironmentVariables": "1.1.0","Microsoft.Extensions.Configuration.Json": "1.0.0","Microsoft.Extensions.Configuration.UserSecrets": "1.0.0","Microsoft.Extensions.DependencyInjection.Abstractions": "1.1.0","Microsoft.Extensions.Logging": "1.1.0","Microsoft.Extensions.Logging.Console": "1.0.0","Microsoft.Extensions.Logging.Debug": "1.0.0","Microsoft.Extensions.Options.ConfigurationExtensions": "1.0.0","Microsoft.Framework.DependencyInjection.Abstractions": "1.0.0-beta7","Microsoft.NETCore.App": {"version": "1.0.1","type": "platform"
    },"Microsoft.VisualStudio.Web.BrowserLink.Loader": "14.0.0","Microsoft.VisualStudio.Web.CodeGeneration.Tools": {"version": "1.0.0-preview2-final","type": "build"
    },"Microsoft.VisualStudio.Web.CodeGenerators.Mvc": {"version": "1.0.0-preview2-final","type": "build"
    }
  },"frameworks": {"netcoreapp1.0": {"imports": ["dotnet5.6","portable-net45+win8"
      ]
    }
  },"publishOptions": {"include": ["wwwroot","**/*.cshtml","appsettings.json","web.config"
    ]
  },"runtimeOptions": {"configProperties": {"System.GC.Server": true
    }
  },"scripts": {"prepublish": [ "bower install", "dotnet bundle" ],"postpublish": [ "dotnet publish-iis --publish-folder %publish:OutputPath% --framework %publish:FullTargetFramework%" ]
  },"tools": {"BundlerMinifier.Core": "2.0.238","Microsoft.AspNetCore.Razor.Tools": "1.0.0-preview2-final","Microsoft.AspNetCore.Server.IISIntegration.Tools": "1.0.0-preview2-final","Microsoft.EntityFrameworkCore.Tools": "1.1.0-preview4-final","Microsoft.EntityFrameworkCore.Tools.DotNet": " 1.1.0-preview4-final","Microsoft.Extensions.SecretManager.Tools": "1.0.0-preview2-final","Microsoft.VisualStudio.Web.CodeGeneration.Tools": {"version": "1.0.0-preview2-final","imports": ["portable-net45+win8"
      ]
    }
  },"userSecretsId": "aspnet-cms-dd6fca74-1002-4839-a8f7-240432a3595b"
}

Is there someone who knows how to solve this??

Thanks in advance!