windows - Failed to add reference to 'Newtonsoft.Json' -

i installed windows 8 on pc , downloaded microsoft visual studio express 2012 windows 8. updated , everything, , when try install thru package manager console, following error:

pm> install-package parse attempting resolve dependency 'newtonsoft.json (≥ 4.5.9)'. installed 'newtonsoft.json 4.5.11'. installed 'parse 1.0.5'. uninstalled 'newtonsoft.json 4.5.11'. install failed. rolling back... install-package : failed add reference 'newtonsoft.json'. @ line:1 char:1 + install-package parse + ~~~~~~~~~~~~~~~~~~~~~     + categoryinfo          : notspecified: (:) [install-package], invalidoperationexception     + fullyqualifiederrorid : nugetcmdletunhandledexception,nuget.powershell.commands.installpackagecommand 

does know how fix error?

thanks, jack

check if have newtonsoft.json reference added in packages.config. if yes, delete newtonsoft.json entry , retry install-package.