Error message No exports were found that match the constraint contract name

Question

This morning I faced a problem while opening my Visual Studio solution  and when I tried to run it  it said      No exports were found that match the constraint contract name   How can I fix this problem

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Deleting the folders haven t worked for me i have go control panel and repaired   Visual Studio Installer Projects extensions for VS 2013    And it worked for me

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I solved this problem by clearing Visual Studio Component Model Cache   Just delete or rename this folder     LocalAppData  Microsoft VisualStudio 11 0 ComponentModelCache   or   LocalAppData  Microsoft VPDExpress 11 0 ComponentModelCache   and restart Visual Studio   The version of Visual Studio you have is specified by the number e g   Visual Studio 2012 is 11 0  as shown above   Visual Studio 2013 is 12 0  Visual Studio 2015 is 14 0  Visual Studio 2017 is 15 0  Visual Studio 2019 is 16 0  For those that don t know    LocalAppData   is the same as C  Users  yourUsername  AppData Local  For those who have multiple versions of Visual Studio installed  e g  2012 and 2013  it might help to remove the ComponentModelCache for both versions before restarting Visual Studio  e g  11 0 and 12 0

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I got this error after reinstalling IntelliJ IDEA and ReSharper for C  in Visual nbsp Studio nbsp 2013    First  I got an error problem with extensions  and after this I got this error       No exports were found that match the constraint contract name      I simply removed folder ComponentModelCache and resolved this error

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I got an error with the same error message - two years later  It s a different problem this time though  related to  NET Core dnx things   I couldn t find an answer on Stack nbsp Overflow  but there s a GitHub issue that contains a workaround  https   github com aspnet Home issues 1455  Below is the most important part of the workaround         Delete the entire C  Program Files  x86  Microsoft Visual Studio   14 0 Common7 IDE Extensions Microsoft Web Tools DNX directory   As far as I understand  it belongs to the old version of ASP NET Core   RC1  which for some reason is still shipped even with Visual nbsp Studio nbsp 2015 Update-3     Delete the C  Users  lt user gt  AppData Local Microsoft VisualStudio 14 0 devenv exe config file    Run the Developer Command Prompt for Visual nbsp Studio nbsp 2015 as Administrator  and execute the devenv  setup command  The new devenv exe config file is generated  This time there are many assemblies that refer to the   C  Program Files  x86  Microsoft Visual Studio 14 0 Common7 IDE Extensions Microsoft DotNet directory    Run the Visual nbsp Studio nbsp 2015 and check that it shows the Microsoft  NET Core Tools  Preview 2  14 1 20624 0 in the Help    About Microsoft Visual Studio menu       Thanks to olegburov s post on GitHub for figuring this out

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No need to rename or delete the whole folder       AppData     Local Microsoft VisualStudio 11 0 ComponentModelCache    Just rename or delete the Microsoft VisualStudio Default cache file inside the above location

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for Visual Studio 2012 and later versions  the solution must be deleting the content of the folder ComponentModelCache   C  Users  username  AppData Local Microsoft WDExpress 11 0 ComponentModelCache   Visual Studio 2013  C  Users  username  AppData Local Microsoft VisualStudio 12 0 ComponentModelCache

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If you have VS 2013  you have to go to   LOCALAPPDATA  Microsoft VisualStudio 12 0 then rename the ComponentModelCache folder

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My 2 cents  Following all above lifesaving tips  I had a slightly different experience  mine is VS 2017 Community Edition  installed once  and I notice that have all these 3 folders     LocalAppData  Microsoft VisualStudio 15 0    gt  Empty  LocalAppData  Microsoft VisualStudio 7f0c75b0    gt  has only the CoreCon folder   This is the one that has the ComponentModelCache    LocalAppData  Microsoft VisualStudio 15 0 7f0c75b0   Deleting only the Microsoft VisualStudio Default cache had no effect   So  I deleted all 4 files there   cache   err   external and catalogs  On restarting VS  problem gone and appeared a 5th file    Microsoft VisualStudio Default scan

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I had to uninstall some external components like Postsharp and Apex and then it worked  I also tried the chosen solution but it gave me more errors

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This issue is because of a MEF cache corruption   Installing the feedback extension  or installing any extension  will invalidate the cache causing VS to rebuild it   click for source

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This happened to me with Visual Studio 2013 Web  after Windows installed several updates  Unfortunately none of the suggestions in this thread helped   I had to re-run the installer and select the  Repair  option  After that  and a reboot  it was working once again   In some cases you may have to repair more than one version of Visual Studio  One example is when a Script Task control in VS 2013 opens VS 2012 when you click Edit Script

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This issue can be resolved by deleting or clearing all the folders and files from  AppData     Local Microsoft VisualStudio 11 0 ComponentModelCache  This actually clears the Visual Studio component model cache   On Windows nbsp 7 machines  the path is different  When you type  appdata  in Run dialog  it opens the folder C  Users  lt username gt  AppData Roaming   Click the  up  button to navigate to the parent folder and select the folder  Local    Final path  C  Users  lt username gt  AppData Local Microsoft VisualStudio 11 0 ComponentModelCache

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I have Windows 7 x64 with a second partition on which Windows 8  preview installed   While working with Microsoft Visual Studio Express 2012 for Windows Phone  I come up with the same problem  But the ComponentModelCache is found here   C  Users Jayaram AppData Local Microsoft VPDExpress 11 0    I am unable to delete or rename as I get the  access is denied  message when I try to use command prompt   Administrator  VS2012 X64 CrossToolsCommandPrompt

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Renaming the ComponentModelCache folder worked for me in Visual Studio 2015  but with a slightly different path    AppData     Local Microsoft VisualStudio 14 0 ComponentModelCache

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Remove ComponentModelCache folder content     AppData    Local Microsoft VisualStudio 11 0 ComponentModelCache

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Visual Studio Express 2012 has different paths   Visual Studio Express       Users  user  AppData Local Microsoft WDExpress 11 0 ComponentModelCache   With Visual Studio Express 2012 for Web       Users  user  AppData Local Microsoft VWDExpress 11 0 ComponentModelCache   I did not have to re-install Visual Studio Express

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I experienced a similar problem after some updates released from Microsoft  part of them where about  NET framework 4 5    On the Internet I got the following link to the Microsoft knowledge base article   Update for Microsoft Visual Studio 2012  KB2781514   It worked for me

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Removing ComponentModelCache did not work for me   Reinstalling VS 2019 did thanks to a recommendation on this Microsoft support thread   Details   This seems to be a known bug with a fix incoming from MS  as of 1 7 2020  Experienced after upgrading from VS2019 Pro 16 2  i think it was   to 16 4 2 using Visual Studio Installer Error displayed when trying to launch both nuget console and nuget package manager

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I am using Visual nbsp Studio nbsp 2012  After installing the Visual nbsp Studio nbsp 2013 web express  when I want to run or open any project in Visual nbsp Studio nbsp 2012 it shows me the following error       no exports were found that match the constraint contract name     I also tried the above solution for clearing the ComponentModelCache  but I did not find the folder  I solves my problem just by  Repair Visual nbsp Studio nbsp 2012  For the Express versions of the software  the folder you need is in a slightly different place s   For Express 2012 for Web it is C  Users XXXXXXXX AppData Local Microsoft VWDExpress - not in the Visual Studio folder

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For Visual nbsp Studio nbsp 2013 you need to remove that folder from this path    AppData     Local Microsoft VisualStudio 12 0

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I had the same problem upon launching Visual nbsp Studio nbsp 2013 Ultimate  and the solutions here didn t work for me  I tried deleting the mentioned folders and starting Visual Studio again  but it didn t work   However I had other problems too  like Microsoft visual studio package did not load correctly and also Page   39 312e8a59-2712-48a1-863e-0ef4e67961fc  39  not found VS 2012  The latter refers to a message in the Team Explorer window saying  Page  somenumber  cannot be found    So I run devenv  setup on the Visual Studio command prompt with administrative rights  It did the job  and everything is fine now

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Clearing the folders didn t work for me  So I went to  Programs and Features  and used the change button to startup the Visual Studio 2013 setup   In the setup I choose the repair function and that fixed the problem for me

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This will really work like a champ   Solution  Try to delete ComponentModelCache folder from the below location    C   Users  your user name  AppData Local Microsoft VisualStudio  Visual Studio version number    And after successful delete  recreate the folder with the same name   ComponentModelCache

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I had the same problem with Visual Studio Express 2013 of Windows 8 1   Unfortunatly there was no  ComponentModelCache  folder in   AppData    Local Microsoft VisualStudio 12 0 ComponentModelCache   I found the  ComponentModelCache  folder in     Users username  AppData Local Microsoft WDExpress 12 0  and solved this problem by removing this folder from there

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Deleting the Component Model Cache did not work for me  well  the relative directory given above did not exist in my machine   Instead  I installed an extension to Visual Studio 2012 Express  Menu Tools   Extensions and Updates      Online   Choose any and then download  This apparently invalidates the cache causing Visual Studio to rebuild it  Here s my source

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i experienced this problem in Microsoft Visual Studio Express 2012 for windows phone while trying to open file    Then i browsed to     C  Users MyUserName AppData Local Microsoft VPDExpress 11 0 ComponentModelCache   And Inside ComponentModelCache i deleted Microsoft VisualStudio Default cache CACHE file  Finaly i restarted visual studio and reopened my project   Then my problem was solved  i was able to open file   Note  My OS is windows 8  And i installed SDK 8 for developing windows phone app  Thanks

[visual-studio] Error message "No exports were found that match the constraint contract name"

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