Net picking wrong referenced assembly version

Question

I just copied an existing project to a brand new machine to start developing on it and have run into a problem with the version of one of my referenced assemblies  a telerik DLL as it happens    The project originally referenced an older version of the assembly  lets call it v1 0 0 0    My new machine has the latest version of the assembly installed  so I thought I d updated it  lets call the new version v2 0 0 0    Now here s the problem  If I copy the old v1 0 0 0 dll to the project folder and add it as a reference  the web site launches without a problem   If I delete that reference  and also delete the old DLL from my system  and add the new version  v2 0 0 0   the page shows the following exception      Could not load file or assembly    XXXXXX  Version 1 0 0 0    Culture neutral    PublicKeyToken 121fae78165ba3d4  or   one of its dependencies  The located   assembly s manifest definition does   not match the assembly reference     Exception from HRESULT  0x80131040    Clearly  the code is looking for the out of date version and can t find it   But why   I greped the solution folder for that version number and couldn t find a single reference   I double checked the text of the  csproj file and found the version correctly shows the latest version and the HintPath correctly shows the path to the new DLL   Furthermore  because I didn t install the old DLL on the system it doesn t show up in my GAC  though v2 0 0 0 does  as expected    I then enabled the fusion log viewer to try to figure out why it s looking for that old version  but no luck   Assembly Load Trace  The following information can be helpful to determine why the assembly  XXXXXX  Version 1 0 0 0  Culture neutral  PublicKeyToken 121fae78165ba3d4  could not be loaded        Pre-bind state information     LOG  User   MyComp me LOG  DisplayName   XXXXXX  Version 1 0 0 0  Culture neutral  PublicKeyToken 121fae78165ba3d4   Fully-specified  LOG  Appbase   file    d  My Documents Visual Studio 2010 Projects CoolProj WebApp  LOG  Initial PrivatePath   d  My Documents Visual Studio 2010 Projects CoolProj WebApp bin Calling assembly   WebApp  Version 1 0 0 0  Culture neutral  PublicKeyToken null      LOG  This bind starts in default load context  LOG  Using application configuration file  d  My Documents Visual Studio 2010 Projects CoolProj WebApp web config LOG  Using host configuration file   LOG  Using machine configuration file from C  WINDOWS Microsoft NET Framework v4 0 30319 config machine config  LOG  Post-policy reference  XXXXXX  Version 1 0 0 0  Culture neutral  PublicKeyToken 121fae78165ba3d4 LOG  Attempting download of new URL file    C  WINDOWS Microsoft NET Framework v4 0 30319 Temporary ASP NET Files root 90233b18 10d54998 XXXXXX DLL  LOG  Attempting download of new URL file    C  WINDOWS Microsoft NET Framework v4 0 30319 Temporary ASP NET Files root 90233b18 10d54998 XXXXXX XXXXXX DLL  LOG  Attempting download of new URL file    d  My Documents Visual Studio 2010 Projects CoolProj WebApp bin XXXXXX DLL  WRN  Comparing the assembly name resulted in the mismatch  Major Version ERR  Failed to complete setup of assembly  hr   0x80131040   Probing terminated    All it says it that it starts by looking for that old assembly   I have tried to find a solution online and saw this similar SO question  but it seems to be the exact opposite of my problem   That questioner s program was finding the wrong DLL instead of the referenced one   Whereas my problem is that the program is mysteriously looking for the wrong DLL and unable to find it when the right one can be found locally in the bin folder and in the GAC   Why is mine looking for the old version   Where else can I search to find this bad reference

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I was getting       Could not load file or assembly  XXX-new-3 3 0 0  or one of its dependencies  The located assembly s manifest definition does not match the assembly reference   Exception from HRESULT  0x80131040    It was because I changed the name of the assembly from XXX dll to XXX-new-3 3 0 0 dll  Reverting name back to the original fixed the error

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In case is saves someone else 3 hours    my case was a bit different  My code used DevExpress v11 1 v11 1 4 0  I had it all referenced correctly in my code  But  net memory profiler installed DevExpress v11 1 v11 1 12 0 in the GAC  In fact it wasn t the components I referenced but the ones they referenced internally that failed  Try as I might  the GAC is always checked first  It compiled and ran fine but I couldn t view the win forms designer and the stack trace was no help at all  Finally uninstalled  net memory profiler and all was restored

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In My Visual Studio 2015  I ensured that the offending Visual Studio Project s Reference Paths List is empty

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Try     cleaning temporary project files cleaning build and obj files cleaning old versions installed at C  Users USERNAME  nuget packages    That worked for me

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This is what worked for me   I was using the Microsoft IdentityModel Clients ActiveDirectory version 3 19 in a class library project but only had version 2 22 installed in the actual ASP NET Web Application project  Upgrading to 3 19 in the web app project got me past the error

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Maybe this helps or maybe not   I cleaned my debug and release versions then I renamed the OBJ folder   This finally got me thorugh   Previous steps were basically project removing references and them adding them back in at the project properties

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I tried most of the answers but still couldn t get it to work  This worked for me   right click on reference -  properties -  change  Specific Version  to false     Hope this Helps

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This isn t a clear answer as to why  but we had this problem  here s our circumstances and what solved it   Dev 1   Solution contains Project A referencing a NuGet Package  and an MVC project referencing Project A  Enabled NuGet Package Restore  then updated the NuGet package  Got a runtime error complaining the NuGet lib can t be found - but the error is it looking for the older  non-updated version  Solution  and this is ridiculous   Set a breakpoint on the first line of code in the MVC project that calls Project A  Step in with F11  Solved - never had a problem again   Dev 2   Same solution and projects  but the magic set breakpoint and step in solution doesn t work  Looked everywhere for version redirects or other bad references to this Nuget package  removed package and reinstalled it  wiped bin  obj  Asp Net Temp  nothing solved it  Finally  renamed Project A  ran the MVC project - fixed  Renamed it back to its original name  it stayed fixed   I don t have any explanation for why that worked  but it did get us out of a serious lurch

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Do you have any other projects in that solution   may be another project was referencing an old version  Usually in VS  dll dependency spans all projects in the solution

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This error was somewhat misleading - I was loading some DLLs that required x64 architecture to be specified   In the  csproj file    lt PropertyGroup Condition     Configuration    Platform       Release-ABC AnyCPU   gt       lt OutputPath gt bin Release-ABC lt  OutputPath gt       lt PlatformTarget gt x64 lt  PlatformTarget gt   lt  PropertyGroup gt    A missing PlatformTarget caused this error

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In my case  I accidentally chose the wrong version of the Telerik package from nuget  which nuget then replaced every package i referenced with the incorrect version  It then inserted a binding redirect to the incorrect version so that even after I replaced everything with the correct version  it was still looking for the incorrect version

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If you are experiencing this problem when testing and or debugging the application from the Visual Studio environment  ASP NET Development Server   it is necessary to delete all temporary files on the development website folder  To know where that folder is  look for the ASP NET Development Server icon on the Windows tray icon  it should have a title like this  ASP NET Development Server - Port        right click the icon and select Show Details  thn  the field Physical path will tell you what the temporary folder is  all items there should be deleted to solve the problem  Build and run again the website and the problem should be solved  again  solved for the Development Environment

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I had the same message when switching between two versions of an application that referenced different versions of the same DLL  Although I was testing in different folders I accidentally copied the newer version over the older version   So the first thing to check is the version of the referenced DLL in the application s folder  Just in case

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Its almost like you have to wipe out your computer to get rid of the old dll   I have already tried everything above and then I went the extra step of just deleting every instance of the  DLL file that was on my computer and removing every reference from the application   However  it still compiles just fine and when it runs it is referencing the dll functions just fine   I m starting to wonder if it is referencing it from a network drive somehwere

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I had a similar issue and I had to delete everything from the bin and obj folders and rebuild to get past my issue  Hope this helps

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My guess is that another assembly you are using is referencing the old dll  Are you familiar with all of the other project references being used and do any of them have a reference to the Telerik dlls   Can you put in a binding redirect in your web config file like this    lt dependentAssembly gt    lt assemblyIdentity name  Telerik  publicKeyToken  121fae78165ba3d4   gt    lt bindingRedirect oldVersion  1 0 0 0  newVersion  2 0 0 0   gt   lt  dependentAssembly gt

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I m with Chris Conway on this one  upvoted him    The problem is that you are referencing one of the telerik assemblies in your project which references another one that isn t there   First thing  I wouldn t install ANY vendor  ie  telerik  assemblies into the GAC  Telerik s stuff is compiled down to just two assemblies anyway  telerik web design and telerik web ui    Just deploy those with the application   Second  in each of your  proj files  like  csproj  there is going to be a  lt reference include   gt  which points to the Telerik Web UI file   This normally contains a version number   Make sure the assembly you put in the bin folder matches that version   Third  make sure ALL of your projects use the latest assembly   Also make sure they are grabbing the assembly from a local path instead of the GAC   I really really don t like the GAC   It has caused no end of issues on some projects I ve been on    We typically have an  Assemblies  folder that all projects use for external assembly references   Fourth  visual studio automatically searches your gac everytime a web site project is loaded and retargets the assembly locations if it finds something in the gac   I can t remember if it ever does this for web application projects  but I haven t had the issue in a long time with those   This can cause similar issues during deployment   Fifth  you can rebind version numbers for assemblies in the web config   In the runtime assemblybinding section you can use something like the following which takes every telerik assembly deployed in 2008 forward and points it to a very particular version      lt dependentAssembly gt       lt assemblyIdentity name  Telerik Web UI  publicKeyToken  121fae78165ba3d4    gt       lt bindingRedirect oldVersion  2008 0 0 0-2020 0 0 0  newVersion  2010 02 0713 35    gt     lt  dependentAssembly gt

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In my case i had 3 projects  1 main project and 2 sub projects referenced by main project   So i updated the main project  leaving out sub project  That s where the conflict was  After i updated all my project everything worked just fine

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In VS2017  have tried all the above solution but nothing works  We are using Azure devops for versioning     From the teams explorer   Source Control Explorer       Select the project which driving you nuts for a long time  Right click the branch or solution   Advanced   get specific version      Then make sure You have ticked the checkbox of overwrite files as per screenshot

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My problem was that the old assemblies were in the  bin deployableAssemblies folder under the Web Application   This meant the old assemblies were overwriting the GAC assemblies when building the project

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Go to C  WINDOWS Microsoft NET Framework v2 0 50727 CONFIG Find machine config file open in notepad find conflict dll Remove this and save    compilation assemblies addassembly dllName Version 1 0 0000 0000 Culture neutral PublicKeyToken  quot QWEWQERWETERY quot  assemblies compilation  works for me

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I had the same problem with different assemblies referencing different versions of Newtonsoft json   The solution that worked for me was running update-package from Nuget Package Manager Console

[asp.net] .Net picking wrong referenced assembly version

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