i am trying to export gerber files but fails in viewer . !?
Have you exported Gerber files from Abacom's SprintLayout:
https://www.electronic-software-shop.com/lng/en/electronic-software/sprint-layout-60.html?language=en
Are you trying to import these Gerber files into JLCPCB here:
https://easyeda.com/order
If you are having problems doing this please see:
https://docs.easyeda.com/en/Export/Export-Gerber-Files/index.html
Please also check that the file suffixes of the exported Gerbers match those expected by JLCPCB.
For more help, contact Support @ JLCPCB.com
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Brand new interactions and interfaces.
Smooth support for design sizes of over 3W
devices or 10W pads.
More rigorous design constraints, more
standardized processes
For enterprises, more professional users.
Easy to use and quick to get started.
The process supports design scales of 300
devices or 1000 pads.
Supports simple circuit simulation.
For students, teachers, creators.
Brand new interactions and interfaces. 
Easy to use and quick to get started. 
Have you exported Gerber files from Abacom's SprintLayout:
https://www.electronic-software-shop.com/lng/en/electronic-software/sprint-layout-60.html?language=en
Are you trying to import these Gerber files into JLCPCB here:
https://easyeda.com/order
If you are having problems doing this please see:
https://docs.easyeda.com/en/Export/Export-Gerber-Files/index.html
Please also check that the file suffixes of the exported Gerbers match those expected by JLCPCB.
For more help, contact Support @ JLCPCB.com