Just placed an order for some boards, and received a message back from JLC that the bottom solder mask layer was not present. Inspected my gerber files, and there is a bottom solder mask file present, but no matter what software I use the bottom solder mask does not show up. In fact it crashes GerbView software when I try to add the layer, top solder mask works just fine. Here's a screenshot of the board in JLC's preview window. ![image.png](//image.easyeda.com/pullimage/7FkWNynuBHXMKlhBGQOsz6x5IHG67amzjCofFuom.png) Any ideas on why this is happening? Need to get these boards ordered asap, but I'm not sure how to respond to the JLC representative. The bottom layer is a copper plane with a couple of vias down to it. The JLC rep is giving me two options: "If it is normal, there will be two cases that we deal with the order: 1) to cover it all with tin 2) to cover it all with solder mask. No copper exposed is available. Then how to do with your order? Situation 1 or 2???"