I'm brand new to QGIS but 10+ years ago I was adept with ArcGIS. I installed 3.2.0 just a few days ago and all went well at first. I located/downloaded/imported the data I want and added a field to the table in each layer. I'm using Windows 10 Home v.1803, 64-bit. Now I want to create new layers using that new field. Screeching halt.
I can't create a new layer. I can't clip the layer. I can't filter the layer. I can't create anything else, apparently, because I keep getting some version of this error:
"Export to vector file failed. Error: Creation of data source failed (OGR error: sqlite3_open(NC GeoRegions.gpkg) failed: unable to open database file)"
I'm not sure what database it's trying to open, or I would check out its read-write permission. And anyway I can't believe the message is accurate. If QGIS cannot "open" a database, how in the world can it read that database to populate attribute tables? It makes no sense on its face.
What am I doing wrong?