Diptrace Gerber Files show Empty Bottom Paste layer! Why?

[tomthumbblues]

For some unknown reason first time ever encountered, I have finished my PCB design and tried to have it fabricated and find my Gerber file PCB preview will not show as usual on the Fabricator website order process. I subsequently found the problem seems to be the complete Bottom Paste Gerber file is 100 % empty, nothing to see here folks.
This has never been an issue previously, so just wondering does anyone have any insight as to what the cause for this is, and how I might rectify the problem, without having to completely redo the whole design? Any help and all suggestions, greatly appreciated. Thankyou.
Trevor

[Alex]

Bottom paste gerber file will be empty if there is nothing on bottom paste layer. For example, there are no SMD components on bottom side (paste mask is normally created for SMD pads only). In that case, there is nothing to export to bottom paste gerber file. In such case, it is recommend to exclude empty file from PCB order to avoid confusion.