c# - WebHostBuilder.Build() MissingMethodException in .NET Core migrated solution -


i'm migrating solution built .net core sdk 1.0.0-preview2-1-003177 because want use in visual studio 2017. use dotnet migrate command .net core sdk 1.0.1, goes well, compiles. when run web part iis express classic program.cs containing

var host = new webhostbuilder()     .usekestrel()     .usecontentroot(directory.getcurrentdirectory())     .useiisintegration()     .usestartup<startup>()     .build();  host.run();

crashes @ build() exception

system.missingmethodexception: 'method not found: 'system.iserviceprovider microsoft.extensions.dependencyinjection.servicecollectioncontainerbuilderextensions.buildserviceprovider(microsoft.extensions.dependencyinjection.iservicecollection)'.'

i can't find reason @ all.

it looks of dependencies, not updated right version. can old version or new version. can create new project ( dotnet new ) , validate packages version on csproj file. 99% of error cause version mismatch.


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