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Please make sure you can connect to 'PISVR1' using the PI SDK utility- it looks like pibufss can't find this server in your known servers table (which is strange). If you are unable to connect to this server with the utility, please verify that you have the appropriate mapping/trust created on the PI server.
Since you're using the Virtual Learning Environment for the Configuring a Simple PI System online course, I think the issue is that your PI Data Archive name is wrong. In the environment, the machine name is PISRV1 not PISVR1.
You specify a default PI Data Archive when you install your first piece of PI software on a machine. In the case of this course, since the machine PIINT1 didn't have any PI software on it initially, you would have specific this when you installed PI ICU or the PI Interface for OPC DA (around the 4:50 minute mark in this course video - RETIRED: Installing a PI Interface and PI Interface Configuration Utility ).
The fastest way to resolve this would be to open the PI SDK Utility (AboutPI-SDK), add an entry for PISRV1 and delete your existing entry for PISVR1. Details on the AboutPI-SDK can be found in this video - OSIsoft: Edit the KST with PISDKUtility - YouTube