c# - ASP.Net 5 - Dependency issues -

i having great deal of issues asp.net 5, , having 1 has been occurring since have upgraded project beta5. error following:

severity code description project file error cs0433 type 'ihostingenvironment' exists in both 'microsoft.aspnet.hosting.abstractions, version=1.0.0.0, culture=neutral, publickeytoken=null' , 'microsoft.aspnet.hosting.interfaces, version=1.0.0.0, culture=neutral, publickeytoken=null' uniti.api.dnx 4.5.1 d:\alex\projects\uniti\src\uniti.api\startup.cs

i have no clue how resolve error, , looking solving it. reference, project.json file located @ https://gist.github.com/mw2nukeboy/a65d3acb55f3c7799f6e

{   "webroot": "wwwroot",   "version": "1.0.0-*",    "dependencies": {     "entityframework": "7.0.0-beta4",     "entityframework.sqlserver": "7.0.0-beta4",     "entityframework.commands": "7.0.0-beta4",     "microsoft.aspnet.diagnostics": "1.0.0-beta5",     "microsoft.aspnet.mvc": "6.0.0-beta5",     "microsoft.aspnet.server.iis": "1.0.0-beta5",     "microsoft.aspnet.server.weblistener": "1.0.0-beta5",     "microsoft.aspnet.staticfiles": "1.0.0-beta5",     "microsoft.aspnet.identity.entityframework": "3.0.0-beta5",     "microsoft.aspnet.identity": "3.0.0-beta5",     "microsoft.framework.configuration": "1.0.0-beta5",     "microsoft.framework.configuration.json": "1.0.0-beta5",     "microsoft.aspnet.authentication.oauthbearer": "1.0.0-beta5"   },    "commands": {     "web": "microsoft.aspnet.hosting --server microsoft.aspnet.server.weblistener --server.urls http://localhost:5000",     "ef": "entityframework.commands"   },    "frameworks": {     "dnx451": { },     "dnxcore50": { }   },    "exclude": [     "wwwroot",     "node_modules",     "bower_components"   ],   "publishexclude": [     "node_modules",     "bower_components",     "**.xproj",     "**.user",     "**.vspscc"   ] }