I ran into this error earlier today and after reading a similar post. Maciej suggestion “Some dependencies are missing”, pointed me in the right direction. It made me think to check for a later version and I found the following.
I uninstalled the original and installed UIPath.System.Activities version19.12.0 preview, and this made the error for “AsEnumerable” not part of “System.Data.DataTable” disappear, which was my issue.
I also saw a note in the video I was watching with the following recommendation.
When I checked my xaml file, the Assembly reference had been added as a result of installing the latest version. So, it appears the UIPath team solved the problem and it works great for my issue.
One question I have pertains to doing the reinstallation each time I create a new Blank Process or new REF Template. Would one alternative be to load that new Assembly into the default xaml files? Or is there a better approach?
Thanks Maciej for your suggestion. Hope this helps anyone else who may be running into this error.