installing nuget package “same key has already been added.”

Question

i am trying to install Microsoft.Bcl.Build 1.0.14

nuget returns

Installing \'Microsoft.Bcl.Build 1.0.14\'. Successfully installed \'Microsoft.Bcl.Bu         


        

Answer 1

Your stack-trace tells the tale, it is NuGet.NetPortableProfileTable.BuildPortableProfileCollection() that fails. In a nutshell, it iterates the set of PCL reference assembly profiles and encounters the same profile more than once. This is a very strong hint that the content of your c:\program files (x86)\reference assemblies\microsoft\framework\.netportable directory is corrupted.

There are many possible ways to go about fixing the damage:

• If you have an active recollection of tinkering with this directory, like copying files, then undo what you did.
• Safest way to go about it is to uninstall all Visual Studio versions >= VS2010. Then clean up the directory by hand, deleting any stray files that are still present. Then reinstalling VS again.
• The not-so-safe but speedier way is to rename the c:\program files (x86)\reference assemblies directory and install the multi-targeting pack. I can't promise success.
• You can try to find the duplicate yourself and remove it. The directory structure looks like this:

---

 Directory of C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETPortable\v4.0\Profile

05/14/2014  01:01 PM              Profile1
05/14/2014  01:01 PM              Profile102
05/14/2014  01:01 PM              Profile104
05/14/2014  01:01 PM              Profile131
05/14/2014  01:01 PM              Profile136
05/14/2014  01:01 PM              Profile14
05/14/2014  01:01 PM              Profile143
05/14/2014  01:01 PM              Profile147
05/14/2014  01:01 PM              Profile154
05/14/2014  01:01 PM              Profile158
05/14/2014  01:01 PM              Profile18
05/14/2014  01:01 PM              Profile19
05/14/2014  01:01 PM              Profile2
05/14/2014  01:01 PM              Profile225
05/14/2014  01:01 PM              Profile23
05/14/2014  01:01 PM              Profile24
05/14/2014  01:01 PM              Profile240
05/14/2014  01:01 PM              Profile255
05/14/2014  01:01 PM              Profile3
05/14/2014  01:01 PM              Profile328
05/14/2014  01:01 PM              Profile336
05/14/2014  01:01 PM              Profile344
05/14/2014  01:01 PM              Profile36
05/14/2014  01:01 PM              Profile37
05/14/2014  01:01 PM              Profile4
05/14/2014  01:01 PM              Profile41
05/14/2014  01:01 PM              Profile42
05/14/2014  01:01 PM              Profile46
05/14/2014  01:01 PM              Profile47
05/14/2014  01:01 PM              Profile5
05/14/2014  01:01 PM              Profile6
05/14/2014  01:01 PM              Profile88
05/14/2014  01:01 PM              Profile92
05/14/2014  01:01 PM              Profile95
05/14/2014  01:01 PM              Profile96

 Directory of C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETPortable\v4.5\Profile

05/14/2014  12:59 PM              .
05/14/2014  12:59 PM              ..
05/14/2014  01:01 PM              Profile111
05/14/2014  01:01 PM              Profile259
05/14/2014  01:01 PM              Profile49
05/14/2014  01:01 PM              Profile7
05/14/2014  01:01 PM              Profile78

 Directory of C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETPortable\v4.6\Profile

05/14/2014  12:59 PM              .
05/14/2014  12:59 PM              ..
05/14/2014  01:01 PM              Profile151
05/14/2014  01:01 PM              Profile157
05/14/2014  01:01 PM              Profile31
05/14/2014  01:01 PM              Profile32
05/14/2014  01:01 PM              Profile44
05/14/2014  01:01 PM              Profile84