Those are not DRC errors, those are net incomplete flags. Indicating you have not connected all traces on those nets.

If you can't see which pin is not connected. Hide the top, bottom (and inner layers if you have them) and make sure the ratline layer is enabled. Look for the blue lines indicating disconnected pins. Now you know which pins you still need to connect when you re enable your other layers.

As @cjohnson says, these are warnings rather than DRC errors.

A few versions ago in EasyEDA, an easy way to locate incomplete connections was introduced.

1. Click on the nets in turn in the upper section of the Design Manager panel.
2. For
   each of the selected nets, in the lower section of the Design Manager
   panel there will be a folder icon called Net Pins with a number
   indicating the number of pins or pads on that net. Opening the folder
   will show a list of the pins or pads.
3. If
   there are
   incomplete connections then there will also be a folder icon called Net
   Ratlines with a number indicating the number of ratlines or incomplete
   net segments on that net. Opening the folder will show a list of the
   ratlines.
4. Look
   at the list of Net Ratlines and Net Pins in the lower section of the
   Design Manager panel and at the warning message in the bottom of that
   panel.
5. Then click on each ratline, pin or pad in the list in turn to locate it then check it.