I am trying to set up a build pipeline for the Windows Universal Sample Application File Access Project.
The pipeline is using the Azure Pipelines Hosted VS2017 Imag
The error is due to the fact that your app is targeting the 1809 SDK (v17763), which has not been rolled out on the build agents yet, due to some issues.
Until it has been rolled out on the agents, you have two options to get unblocked:
I will update the answer once there is an update regarding the SDK rollout to build agents.