How can I fix assembly version conflicts with JSON NET after updating NuGet package references in a new ASP NET MVC 5 project

Question

I created a new ASP NET MVC 5 web project in VS 2013  Update 1  then updated all NuGet packages  When I build the project  I get the following warning      warning MSB3243  No way to resolve conflict between  Newtonsoft Json  Version 6 0 0 0   Culture neutral  PublicKeyToken 30ad4fe6b2a6aeed  and  Newtonsoft Json  Version 4 5 0 0  Culture neutral  PublicKeyToken 30ad4fe6b2a6aeed     When I check the web config  however  I see that a binding redirect is in place      lt dependentAssembly gt       lt assemblyIdentity name  Newtonsoft Json  publicKeyToken  30ad4fe6b2a6aeed  culture  neutral   gt       lt bindingRedirect oldVersion  0 0 0 0-6 0 0 0  newVersion  6 0 0 0   gt     lt  dependentAssembly gt    Which is exactly what the warning advises   How can I fix this warning

User · Answer

The final solution to your assembly redirect errors

Okay, hopefully this should help resolve any (sane) assembly reference discrepancies ...

Check the error.

Check web.config after the assembly redirect. Create one if not exists.

Right-click the reference for the assembly and choose Properties.

Check the Version (not Runtime version) in the Properties table. Copy that.

Paste into the newVersion attribute.

For convenience, change the last part of the oldVersion to something high, round and imaginary.

Rejoice.

User · Answer

No one mentioned the following  which in my understanding is the correct solution   Go the csproj of the project where the nuget is installed  and set the AutoGEneratedBindingRedirects to false    lt AutoGenerateBindingRedirects gt false lt  AutoGenerateBindingRedirects gt   Full article in MSDN

User · Answer

Here the steps I used to fix the warning    Unload project in VS Edit  csproj file Search for all references to Newtonsoft Json assembly   Found two  one to v6 and one to v5 Replace the reference to v5 with v6  Reload project Build and notice assembly reference failure View References and see that there are now two to Newtonsoft Json  Remove the one that s failing to resolve  Rebuild - no warnings

User · Answer

I updated my package and even reinstalled it - but I was still getting the exact same error as the OP mentioned   I manually edited the referenced dll by doing the following   I removed the newtonsoft json dll from my reference  then manually deleted the  dll from the bin directoy   Then i manually copied the newtonsoft json dll from the nuget package folder into the project bin  then added the reference by browsing to the  dll file   Now my project builds again

User · Answer

If none of the above works  try using this in web config or app config    lt runtime gt       lt assemblyBinding xmlns  urn schemas-microsoft-com asm v1  gt           lt dependentAssembly gt               lt assemblyIdentity name  Newtonsoft Json  publicKeyToken  30AD4FE6B2A6AEED  culture  neutral   gt               lt bindingRedirect oldVersion  0 0 0 0-6 0 0 0  newVersion  6 0 0 0   gt           lt  dependentAssembly gt       lt  assemblyBinding gt   lt  runtime gt

User · Answer

Remember that with the binding redirection      oldVersion  0 0 0 0-6 0 0 0    You are saying that the old versions of the dll are between version 0 0 0 0 and version 6 0 0 0

User · Answer

I upgraded from Newtonsoft Json 11 0 1 to 12 0 2   Opening the project file in Notepad   I discovered both   lt Reference Include  Newtonsoft Json  Version 12 0 0 0  Culture neutral  PublicKeyToken 30ad4fe6b2a6aeed  processorArchitecture MSIL  gt         lt HintPath gt    packages Newtonsoft Json 12 0 2 lib net45 Newtonsoft Json dll lt  HintPath gt       lt  Reference gt    and   lt ItemGroup gt       lt Reference Include  Newtonsoft Json  gt         lt HintPath gt    packages Newtonsoft Json 11 0 1 lib net45 Newtonsoft Json dll lt  HintPath gt       lt  Reference gt     lt  ItemGroup gt    I deleted the ItemGroup wrapping the reference with the hint path to version 11 0 1   These issues can be insanely frustrating to find   What s more  developers often follow the same steps as previous project setups   The prior setups didn t encounter the issue   For whatever reason the project file occasionally is updated incorrectly   I desperately wish Microsoft would fix these visual studio DLL hell issues from popping up   It happens far too often and causing progress to screech to a halt until it is fixed  often by trial and error

User · Answer

Veverke mentioned that it is possible to disable generation of binding redirects by setting AutoGEneratedBindingRedirects to false  Not sure if it s a new thing since this question was posted  but there is an  Skip applying binding redirects  option in Tools Options Nuget Packet Manager  which can be toggled  By default it is off  meaning the redirects will be applied  However if you do this  you will have to manage any necessary binding redirects manually

User · Answer

I had similar issue and just wanted to post an answer for others in my situation   I have a solution running a ASP NET Web Application with multiple other C  class lib projects   My ASP NET Web Application wasn t using json  but other projects where   This is how I fixed it    I made sure all projects where using latest version  6  using NuGet Update on all projects currently using any version of json - this didn t fix the issue I added json to the web application using NuGet - this fixed the issue  let me dive into why     Step 2 was first of all adding a configuration information for json  that suggest that all projects  use the latest version  6  no matter what version they have  Adding the assembly binding to Web Config is most likely the fix   However  step 2 also cleaned up som legacy code  It turned out we have previously used an old version  5  of json in our Web Application and the NuGet folders wasn t deleted when the reference was  I suspect  manually  removed  Adding the latest json  6   removed the old folders  json v5   This might be part of the fix as well

User · Answer

I found to delete this section from the project file fix the problem    lt ItemGroup gt   lt Reference Include  Newtonsoft Json  gt     lt HintPath gt    packages Newtonsoft Json 6 0 1 lib net45 Newtonsoft Json dll lt  HintPath gt   lt  Reference gt

User · Answer

I had this problem because I updated packages  which included Microsoft AspNet WebApi that has a reference to Newtonsoft Json 4 5 6 and I already had version 6 installed  It wasn t clever enough to use the version 6   To resolve it  after the WebApi update I opened the Tools   NuGet Package Manager   Pacakge Manager Console and ran    Update-Package Newtonsoft Json   The log showed that the 6 0 x and 4 5 6 versions were all updated to the latest one and everything was fine   I have a feeling this will come up again

[asp.net-mvc] How can I fix assembly version conflicts with JSON.NET after updating NuGet package references in a new ASP.NET MVC 5 project?

The final solution to your assembly redirect errors

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