I also bumped to this problem. I was receiving the following error, when trying to publish MVCForum 1.7:
Copying file App_Data\NuGetBackup\Hello.txt to obj\Release\Package\PackageTmp\App_Data\NuGetBackup\Hello.txt failed. Could not find file 'App_Data\NuGetBackup\Hello.txt'.
François Breton's comment helped me achieve the solution.
It's simple:
Open your .csproj
file with a text editor (Notepad, Notepad++) Visual Studio will open it as a project.
Press Ctrl
+ F
and search for the file of the problem. In my case the file was "Hello.txt" without commas.
Under the <ItemGroup>
it resided:
<ItemGroup>
<Content Include="App_Data\NuGetBackup\Hello.txt" />
<Content Include="Content\admin\Admin.css">
<DependentUpon>Admin.scss</DependentUpon>
</Content>
...More code omitted due to brevity.
I deleted the <Content Include="App_Data\NuGetBackup\Hello.txt" />
line, and voila! Visual Studio allowed me to Preview before publishing!
It will end like this:
<ItemGroup>
<Content Include="Content\admin\Admin.css">
<DependentUpon>Admin.scss</DependentUpon>
</Content>
...More code omitted due to brevity.