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i start learning MVC. my pc not connect to internet.
installing EntityFramework and the other nuget package, sometimes is very dificult.
but after many tries for install package, another error will be appeare.
after install EntityFramework to my project,after close project, it don't load again.
this error will shown:

.csproj : error  : The default XML namespace of the project must be the MSBuild XML namespace. If the project is authored in the MSBuild 2003 format, please add xmlns="" to the <Project> element. If the project has been authored in the old 1.0 or 1.2 format, please convert it to MSBuild 2003 format. 


What I have tried:

try much

but not get result
Updated 5-Nov-19 21:51pm

NuGet needs an internet connection to download packages, so try to connect to the internet first and then use the NuGet package manager in Visual Studio.

If you really can't get internet, try this:
Is there a way to download packages from then do an offline installation into Visual Studio? - Stack Overflow[^]
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Which version of visual studio you are using? Try to use VS2017 and check.
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