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1. Add NuGet package Microsoft.CodeAnalysis.CSharp
2. This pulls in Microsoft.CodeAnalysis.Common which has a whole LOT of dependencies [see](https://www.nuget.org/packages/Microsoft.CodeAnalysis.Common/)
3. All these dependencies are included in the YAML header [see](https://github.com/xamarin/Workbooks/blob/71120728406a5a05667e9dae85792f617b827269/csharp/roslyn/roslyn-syntax-trees.workbook/index.workbook#L5-L89)
4. The workbook runs fine in this first session when the Nuget was added.
5. Subsequently opening the Workbook fails on Package Restore - error "The 'System.Text.Encoding.CodePages 4.3.0' package requires NuGet client version '2.12' or above, but the current NuGet version is '184.108.40.206'"
[Info][00:00:10.8669960] MessageViewController (LogMessage): PushMessage => Status: Restoring packages… @ /Users/builder/data/lanes/904/1f3067d3/source/inspector/Clients/Xamarin.Interactive.Client/Messages/MessageViewController.cs:98
[Error][00:00:16.7410970] MessageViewController (LogMessage): PushMessage => Alert: The 'System.Text.Encoding.CodePages 4.3.0' package requires NuGet client version '2.12' or above, but the current NuGet version is '220.127.116.11'. @ /Users/builder/data/lanes/904/1f3067d3/source/inspector/Clients/Xamarin.Interactive.Client/Messages/MessageViewController.cs:98
If you manually delete all the dependencies from the YAML [see](https://github.com/xamarin/Workbooks/commit/54a3b4828b04eaa82d2b1fdf8fbf8b66ad56cd78) leaving ONLY
- id: Microsoft.CodeAnalysis.CSharp
then the workbook opens, restores packages, and runs successfully every time. But when all the dependencies are included in the YAML, it fails with the error shown above.
The workbook that loads successfully is [here](https://github.com/xamarin/Workbooks/tree/master/csharp/roslyn/roslyn-syntax-trees.workbook).
*** This bug has been marked as a duplicate of bug 47690 ***