Visual Studio error Object reference not set to an instance of an object after install of ASP NET and Web Tools 2015

Question

After installing the ASP NET and Web Tools 2015  RC1 update 1  I get the following error within ASP NET MVC 4 projects when opening   cshtml files      Object reference not set to instance of an object     I get the same error message even if I start a new ASP NET MVC 4 project and try to open a   cshtml file there   I m using Visual Studio 2015

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For me  ASP NET 5 is not yet required  I removed update  and then reinstalled ASP NET 4 5  It s a bit tricky    Removed from control panel  Microsoft ASP NET 5 RC1 Update1   After that  you will no longer open ASP NET MVC projects Then I changed the installation of  Microsoft Visual Studio Professional 2015   clicked  Modify   and selected  Microsoft Web Developer Tools    No longer follow the notification of update in Visual nbsp Studio nbsp 2015

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I was getting similar error in VS2017 while trying to publish my solution to Azure    This algorithm helped me to resolve it    Close VS2017 Open C  Users your user name  AppData Local Microsoft VisualStudio  folder Rename 15 0 08edcd83 folder Start VS Publish works fine    Note that this will remove your Visual Studio s recent files   projects from it s history and also linking to MS account   This method is slightly different from the Top answer  Here you don t have to delete other folders except renaming abovementioned one

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I was getting this exception every time I created a  new  project   My solution was    Go menu Tools   Extensions and Updates Not check the  Updates  link   search  asp net   There was an update to Microsoft ASP NET and Web Tools  Get it as AspNetWebFrameworksTools2015 KB3137909 exe and install it    That fixed it for me     Unfortunately  I ran into another exception       Exception has been thrown by the target of an invocation    I disabled the FIPS setting Enabled DWORD value to zero    HKEY LOCAL MACHINE SYSTEM CurrentControlSet Control Lsa FipsAlgorithmPolicy  Enabled dword 00000000 And All fixed

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For me     I ended the process in Windows Task Manager  VsHub exe  Restarted Visual Studio    After that  everything works like a charm again

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Goto windows R and type  temp  and hit enter  delete the temp folder and files and then try opening the same

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It s recommended to try any or all of the following    Restart Visual Studio Try Running As Administrator  right-click Visual Studio and choose  Run As Administrator   Check for any updates for Visual Studio  download and install them if any are available  Try opening a different solution   project   If problems persist  you might try the following options    Restart your local machine Attempt to reset Visual Studio to System Defaults  this can be done from the options within Visual Studio  Attempt to repair your Visual Studio installation

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Delete bin and obj folders in all projects of that solution   Seems like those folders were having old files generated by some older version of visual studio  which are not compatible with new version of visual studio

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Restarting Visual Studio did it for me  On the next run  it displayed a  Scanning new and updated MEF components      and then it executed normally    It seems to be related to Windows update somehow  although I don t have proof

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I solved it doing  run devenv  resetuserdata   in this path      x64  C  Program Files  x86  Microsoft Visual Studio 14 0 Common7 IDE   I assume that in x86 it works in this path    x86  C  Program Files Microsoft Visual Studio 14 0 Common7 IDE

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In my case  not necessarily be the solution for you  but it may be helpful for someone   the solution was    Go menu Tools   Extensions and Updates Select the Online tab from the right panel Search for the words web tools  and then select Microsoft ASP NET and Web Tools and install it    In my case  this was missing from my computer because of a lot of repairing operations for Visual Studio

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The solution to the issue when i had this earlier today was that there was an additional set of  tags bolted on the end of my Web config   Once removed the functionality returned

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I was getting an exception every time I tried to create a  new  project   My solution was    Go menu Tools   Extensions and Updates Check the  Updates  link    There was an update to Microsoft ASP NET and Web Tools  Install it    That fixed it for me

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Maybe this helps    Delete the contents from the following folders    C  Users  userprofile  AppData Local Microsoft VisualStudio C  Users  userprofile  AppData Local Microsoft VSCommon  Sometimes  you need to go to     x64  C  Program Files  x86  Microsoft Visual Studio 14 0 Common7 IDE  x86  C  Program Files Microsoft Visual Studio 14 0 Common7 IDE    and run devenv  resetuserdata    Expect  that all of your user settings such as Visual Studio layout  linked Microsoft account or start page might disappear

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After trying the top answer  I found that you must also restart the computer  The error may be part of a git issue as well where restarting your computer will reset

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In the hopes it might narrow things down help someone  I did an investigatory approach   For me  I initially moved the folder at C  Users  user  AppData Local Microsoft VisualStudio to My Documents and allowed Visual Studio to re-create it by re-launching it   This removed the errors   So I moved everything back  one-by-one  and restarted Visual Studio each time until I discovered the culprits   These folders were fine to move back in    1033  overwrote the auto-generated copy with old  Designer  was in my old copy  not initially re-created when I re-launched VS  copied it back in  Extensions  overwrote the auto-generated copy with old  ImageLibrary  overwrote the auto-generated copy with old  Notifications  overwrote the auto-generated copy with old  STemplate  was in my old copy  not initially re-created when I re-launched VS  copied it back in  VTC  was in my old copy  not initially re-created when I re-launched VS  copied it back in    These files were fine to move back in overwrite the auto-generated ones    ApplicationPrivateSettings  was in my old copy  not initially re-created when I re-launched VS  ApplicationPrivateSettings lock  overwrote the auto-generated copy with old  vspdmc lock  overwrote the auto-generated copy with old    These files were fine to move back in   Each was in my old copy  and not initially re-created when I re-launched VS     NETFramework Version v4 0 Set Framework Hash C958D412 dat  NETFramework Version v4 0 Set RecentAssemblies Hash 0 dat  NETFramework Version v4 5 Set Extensions Hash 75EAE334 dat    NETFramework Version v4 5 Set Extensions Hash 497525A2 dat   NETFramework Version v4 5 Set Framework Hash 5AE9A175 dat    NETFramework Version v4 5 2 Set Extensions Hash 24CEEB0D dat    NETFramework Version v4 5 2 Set Extensions Hash 72AE305 dat    NETFramework Version v4 5 2 Set Extensions Hash ADF899D7 dat    NETFramework Version v4 5 2 Set Framework Hash D8E943A2 dat    These caused problems - delete these files and re-launch VS to allow it to re-create them    ComponentModelCache - When I overwrote this folder s contents with my old ones  4 files   MS VS Default cache   catalogs   err   external   this gave me all of the errors I had gotten before about not being able to load packages when loading my project  and the  object reference not set to an instance of an object  error when trying to close VS  devenv exe config - same as ComponentModelCache  NETFramework Version v4 0 Set Extensions Hash 6D09DECC dat - causes error output from the JavaScript Language Service  complaining of missing js files  NETFramework Version v4 0 Set Extensions Hash 9951BC03 dat - causes error output from the JavaScript Language Service  complaining of missing js files   NETFramework Version v4 5 2 Set RecentAssemblies Hash 0 dat - causes error output from the JavaScript Language Service  complaining of missing js files   These are the errors from those last  NETFramework files  which I do not get if I do not add them back in    01 10 11 7550  Referenced file  C  Program Files  x86  Microsoft Visual Studio 14 0 JavaScript References libhelp js  not found  01 10 11 7550  Referenced file  C  Program Files  x86  Microsoft Visual Studio 14 0 JavaScript References sitetypesWeb js  not found  01 10 11 7550  Referenced file  C  Program Files  x86  Microsoft Visual Studio 14 0 JavaScript References domWeb js  not found  01 10 11 7550  Referenced file  C  Program Files  x86  Microsoft Visual Studio 14 0 JavaScript References underscorefilter js  not found  01 10 11 7550  Referenced file  C  Program Files  x86  Microsoft Visual Studio 14 0 JavaScript References showPlainComments js  not found    I might just need to re-install repair the JavaScript Language Service plug-in  so it might be un-related   But definitely devenv exe config and ComponentModelCache need to go to correct the  object reference not set to an instance of an object  error

User · Answer

Problem   My VS 2015 was throwing up error after I installed SSDT  Whenever I clicked on Tools    Extensions and Update it was throwing  Object reference not set to an instance of an object  error  When I tried to open a solution it threw some provider not set correctly    Solution  After many hours of research trying out all the solutions previously mentioned by others didn t solve my problem  Every time the error popup was pointing to check the ActivityLog xml  But I was ignoring it  After hours of frustration I decided to read the error carefully and looked into ActivitLog xml and found that it was looking for  Could not load file or assembly  apos System Collections Immutable  Version 1 1 37 0   So I just started searching for this assembly and stumbled upon this link https   sergeytihon com 2015 12 01 how-to-restore-viual-studio-2015-after-update-1-dependency-dance  and followed the steps there  which fixed my issue   Went into  LOCALAPPDATA  Local Microsoft VisualStudio 14 0 devenv exe config and searched for  System Collections Immutable  and change newVersion from 1 1 36 0 to 1 1 37 0  Final config should look like this   lt dependentAssembly gt    lt assemblyIdentity name  System Collections Immutable  publicKeyToken  b03f5f7f11d50a3a  culture  neutral   gt    lt bindingRedirect oldVersion  1 0 27 0-1 1 65535 65535  newVersion  1 1 37 0   gt   lt  dependentAssembly gt

User · Answer

Delete  LocalAppData  Microsoft VisualStudio 14 0 ComponentModelCache and restart Visual Studio   Alternatively  use the Clear MEF Component Cache extension

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I have been fighting with this during the whole weekend  But it s pretty easy to do it  What I did was to click on repair rather than uninstall  After repairing  I clicked on restart directly  After that  everything is working perfectly  You should try this  may be it can work also for you

[asp.net] Visual Studio error "Object reference not set to an instance of an object" after install of ASP.NET and Web Tools 2015

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