Strange error in latest EASYEDA Std.  It seems to be missing that a pad is connected to the bottom ground plane.  Often resolved by adding a trace to GND for that pad (already connected to bottom ground plane). However that extra pad location is critical.  Moving it often moves the error to a different pad previously thought to be connected to the ground plane.  The images below show that the lower left GND pad of the IC was reported as not connected and resolved by adding a small trace to another grounded pad.  Simply moving this small extra pad to a different location corrects the original error (extra ground trace no longer required for this pin), but moves it to the upper left ground pad of the same IC, now reporting that IT is now no longer connected to the bottom ground plane.    Looks like an indexing bug but I can't find any other patterns other than the errors are always on the left side of the board and the extra bug fix pad has to also be on the left side, usually below the lowest grounded pad, but not always.  Hope this helps.