Hi, I'm trying to lay out a panel with two different but similar PCB designs on them. I have created a panel using the 'board outline' layer to indicate where I would like the V-grooves to be cut. I have added strain relief holes in the corners where the panel rails meet the PCB and where two PCBs join. I have put a 'solid region' of type 'NPTH' in the shape of a diamond in those relief holes to ensure that the easyEDA PCB fab know to cut-out that section, but every time I try to 'redraw copper area' on the ground planes of my individual PCBs I get the 'board outlines are not closed' error. Does anyone know what I might be doing wrong, and how to get this panel to display properly the way I intended it. My project, and the panelized PCBs are here, please take a look and let me know if you can see what the problem is. [https://easyeda\.com/editor\#id=\|e312dcc35e1f4d3eaf7972359636b8dc\|2b721739811547b8828c414ca2c63d69\|4c45b137a578402ebb5223e4267ea1a9\|6ecae83db6874d89a62a1f0e78cc01aa](https://easyeda.com/editor#id=|e312dcc35e1f4d3eaf7972359636b8dc|2b721739811547b8828c414ca2c63d69|4c45b137a578402ebb5223e4267ea1a9|6ecae83db6874d89a62a1f0e78cc01aa) Many thanks in advance