I'm just taking my first look at Workbooks and wanted to create one to learn about Cosmos Graph API.
When I add the package for Microsoft.Azure.Graphs (preview) the following two lines were added:
#r "Microsoft.Azure.Graphs" #r "Mono.CSharp"
At this point the Workbook seems to compile and run just fine. However, if I save it and reload it, it tries to update the packages, which fails.
Here is a screenshot of the error in the status bar and the errors that occur when I try to run it: https://1drv.ms/i/s!Alx9Gegl5WiLkv4Z9zwUXUu36i_7jQ
(I tried inserting an image but the forum wouldn't accept the URLs).