This error is driving me mad. I have looked all the errors (it seems that the cross-
hair of the cursor indicate where) but I have deleted routes/tracks and re-done and same the same.
May we see a screen grab of your PCB?
A picture is worth a thousand words 
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Neither show where zones have filled and not filled . . . you probably have some isolated islands that are not connected to GND even though they are on the GND net.
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@Graham1904
Hotkey B will get you there.
The missed filled zones are not anywhere the error messages are…
Hotkey “B” has been done many times.
like raptor said: most probably isolated zone islands. I think it could be these:
Besides: the picture was already better than 1000 words, but an attached project archive is even better.
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Pin 2 of C19 is also attached to an island. See the ratline (just above the +5V sign) in your very first screen grab.
And my picture. Ratline is single arrow. Unattached Zone is double arrow.
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WOW! It is fixed. It was so hard to see even highlighted GND to see the areas floating.
THANK YOU ALL INPUT 
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@RaptorUK and @mf_ibfeew can fight it out for the “Solved” credit. 
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This is enough for me, another user helped 
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