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I've created a polygon from lines in a couple of cases where I'm unable to select the polygon using the standard Select Features button. I am able to select the feature using the Attributes Table, but in neither case am I able to actually cut and paste the polygon from that layer to another layer.

Any ideas?

(Using QGIS 2.18 on OSX)

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Your polygon isn't closed. If you open the Log Messages Panel you'll see a message on the GEOS tab:

Exception: IllegalArgumentException: Points of LinearRing do not form a closed linestring
  • Aha - I'll dig around to see if I can find that - thanks so much! I was guessing / hoping it was something straightforward. Not sure how it's not closed, as all end points are snapped, but I'm sure there's something I've missed. Thanks! – jeffme Feb 26 '18 at 6:05

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