There are many reasons for the audit failure. You can find the specific reasons below "Audit Failed," as shown in the image below:

Common reasons for audit failure include the following:

   1. The drill size is less than 0.2mm;

   2. The min trace width/spacing is less than 0.1mm;

   3. Lack of information (such as missing solder mask layer, missing silkscreen layer, missing copper layer, missing drill layer);

   4. The gerber provided cannot be opened;

   5. The PCB outline is incomplete;

   6. The spacing from the PCB outline to the copper is less than 0.2mm, which may cause exposed copper;

   7. The hole was drilled onto the trace;

   8. ...