visual studio - Upgraded to .Net Standard 2, now project says reference isnt there -


i upgraded .net standard 1.4 pcl dll .net standard 2.0. trying write method returns valuetuple , error: 

cannot define class or member utilizes tuples because compiler required type 'system.runtime.compilerservices.tupleelementnamesattribute' cannot found. missing reference?

but is...kind of. below project.json says: 

{   "supports": {},   "dependencies": {     "microsoft.netcore.portable.compatibility": "1.0.1",     "netstandard.library": "2.0.0",     "newtonsoft.json": "10.0.3",     "system.collections.specialized": "4.3.0",     "system.componentmodel.annotations": "4.4.0",     "system.net.http": "4.3.2",     "system.reflection": "4.3.0",     "system.runtime.serialization.primitives": "4.3.0",     "system.servicemodel.primitives": "4.4.0",     "system.valuetuple": "4.4.0"   },   "frameworks": {     "netstandard2.0": {}   } }

but when expand references project, notice couple packages aren't listed.

enter image description here

ive tried answer no success.

edit: using vs 2017

i had problem well. turns out .csproj file had lines below, though version referenced .net core 2.0. removed these lines , project built successfully.

<runtimeframeworkversion>1.1.2</runtimeframeworkversion> <packagetargetfallback>$(packagetargetfallback);dnxcore50</packagetargetfallback>

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