Could not load file or assembly System Net Http Formatting or one of its dependencies The system cannot find the path specified

Question

I have a small MVC app that I use for practice reasons  but now I am encountering an error every time I try to debug   Could not load file or assembly  System Net Http Formatting  or one of its dependencies   The system cannot find the path specified    I ve googled but cannot find a solution  I m using  NET 4 5   It can t be the DLL file because I m using  Net 4 5

User · Answer

For those that use  NET Standard project in combination with  NET Framework projects   In the  NET Standard way  packages that are included in a  NET Standard project will correctly be used across other  NET Core and  NET Standard projects   Im the  NET Framework way  if you are referring to a  NET Standard project from an  NET Framework  MVC  project  you need to manually download and install the same nuget packages   So the answer to my question was that I had to download and install Microsoft AspNet WebApi Client in the web project   NET Framework  that is using a  NET Standard project where Microsoft AspNet WebApi Client is needed  In fact  I already had this installed but there was a version difference   I just add this answer for others to see  it might not directly answer OP s question but it did save me time by first checking this instead of doing the top-voted answers

User · Answer

In my case none of the above solutions worked   I solved by right clicking on the reference      System Net Http Formatting   from Visual studio and setting the property Copy Local to true    I hope this is useful somehow

User · Answer

Remove all code references to System Net   in the package window    Install-Package Microsoft AspNet WebApi Client Clean and rebuild your project

User · Answer

Whenever I have a NuGet error such as these I usually take these steps    Go to the packages folder in the Windows Explorer and delete it  Open Visual Studio and Go to Tools   Library Package Manager   Package Manager Settings and under the Package Manager item on the left hand side there is a  Clear Package Cache  button  Click this button and make sure that the check box for  Allow NuGet to download missing packages during build  is checked  Clean the solution Then right click the solution in the Solution Explorer and enable NuGet Package Restore Build the solution Restart Visual Studio   Taking all of these steps almost always restores all the packages and dll s I need for my MVC program     EDIT      For Visual Studio 2013 and above  step 2  should read    Open Visual Studio and go to Tools   Options   NuGet Package Manager and on the right hand side there is a  Clear Package Cache button   Click this button and make sure that the check boxes for  Allow NuGet to download missing packages  and  Automatically check for missing packages during build in Visual Studio  are checked

User · Answer

VS2019  Tools -  Nuget Package Manager -  Package Manager Setting -  in Package Restore section  check 2 options  After that  go to project packages folder and delete all child folders inside  for no longer any error  Then Rebuild solution  Nuget will redownload all packages and project should run without any reference

User · Answer

Probably you need to set library reference as  Copy Local   True  on properties dialog  On visual studio click on  references  then right-click on the missing reference  from the context menu click properties  you should see copy local setting

User · Answer

Removing the following lines from web config solved my problem  Note that in this project I didn t use WebApi components  So for others this solution may not work as expected      lt dependentAssembly gt       lt assemblyIdentity name  System Net Http Formatting  publicKeyToken  31bf3856ad364e35  culture  neutral    gt       lt bindingRedirect oldVersion  0 0 0 0-5 2 3 0  newVersion  5 2 3 0    gt     lt  dependentAssembly gt

User · Answer

What I did to solve this problem is   Go to NuGet package manager  Select Updates  from the left panel  Update WebApi components After that  the project ran without errors

User · Answer

For me it was as simple as   Delete Microsoft AspNet WebApi Client from the packages folder in Windows Explorer Open Tools   NuGet Package Manager   Package Manager Console Click the  Restore  button

User · Answer

user3919888 pointed me in the right direction  but I needed to run Update-Package -reinstall Microsoft AspNet WebApi Client in the Package-Manager console  Basic install by itself does not recognize the problem but does recognize that the package is already installed and does not overwrite it   I m posting this answer because this happens so infrequently that I end up googling and reaching this page before I remember what I did last time

User · Answer

What solved this annoying error for me was just to close Visual Studio and open it again  Then rebuild the solution  and it all worked again  Sorry for the crap answer  but I think it s worth an answer because it solved it for me

User · Answer

As originally suggested in a comment by GeoMac and documented on NuGet s docs the following worked for me when none of the other answers worked   Tools   NuGet Package Manager   Package Manager Console  Update-Package -ProjectName MyProjectName -reinstall

User · Answer

I found an extra      lt dependentAssembly gt       lt assemblyIdentity name  System Net Http  publicKeyToken  b03f5f7f11d50a3a  culture  neutral    gt       lt bindingRedirect oldVersion  0 0 0 0-2 2 28 0  newVersion  2 2 28 0    gt     lt  dependentAssembly gt    in my web config  removed that to get it to work  some other package I installed  and then removed caused the issue

User · Answer

Remove all code references to System Net   Uninstall  Package Microsoft AspNet WebApi and its dependencies  Reinstall all  Package Microsoft AspNet WebApi and its dependencies   Clean and rebuild your project

User · Answer

In my case  none of the above worked  however  replacing 5 2 3 0 with 4 0 0 0 did solve the problem

User · Answer

I was facing the same problem because      System Net Http Formatting   version written inside webconfig was 5 0 3 but inside the bin folder the library System Net Http Formatting dll version was 4 0 2  so I just replaced with the same given inside bin       just do this clean project and build

User · Answer

For Me adding few below line in WebApi config works as after updating the new nuget package did not works out  var setting   config Formatters JsonFormatter SerializerSettings  setting ContractResolver   new CamelCasePropertyNamesContractResolver    setting Formatting   Formatting Indented    Don t forget to add namespace   using Newtonsoft Json Serialization   using Newtonsoft Json

User · Answer

I had the problem with a ASP NET project in VS 2019    Another symptom was  that some references  System Web Http  were marked as faulty in the project references list  Solution Explorer   My solution    Delete the faulty references in Project -  References  right click       Build Navigate to the build errors  The type or namespace name       could not be found  or similar Use the  Show potential fixes  -  Install package   The cause   Looking at the difference in the csproj file I could see the reason for the trouble  Someone managed to reference a DLL in the Windows Program file folder    lt Reference Include  System Web Http  gt     lt HintPath gt                   Program Files  x86  Microsoft ASP NET ASP NET MVC 4 Packages Microsoft AspNet WebApi Core 4 0 30506 0 lib net40 System Web Http dll lt  HintPath gt   lt  Reference gt   lt Reference Include  System Web Mvc  Version 2 0 0 0  Culture neutral  PublicKeyToken 31bf3856ad364e35  processorArchitecture MSIL  gt     lt SpecificVersion gt False lt  SpecificVersion gt     lt HintPath gt                   Program Files  x86  Microsoft ASP NET ASP NET MVC 4 Packages Microsoft AspNet Mvc 4 0 30506 0 lib net40 System Web Mvc dll lt  HintPath gt   lt  Reference gt

[c#] Could not load file or assembly 'System.Net.Http.Formatting' or one of its dependencies. The system cannot find the path specified

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