page does not exist when export to PDF

[zhu zhu]

when exporting to PDF  my confluence displayed: 

The page you were trying to reach could not be found. This could be because:

• The page does not exist.
• The page exists, but you do not have permission to view it.

I've checked  the Confluence PDF Export plugin ,it's fine.This is log:

2016-02-23 16:41:12,874 WARN [http-443-33] [confluence.extra.flyingpdf.ConfluenceExportUserAgent] getImageResource Could not retrieve image resource 

2016-02-23 16:41:46,484 WARN [http-443-11] [atlassian.seraph.auth.DefaultAuthenticator] login login : '159443' tried to login but they do not have USE permission or weren't found. Deleting remember me cookie.
2016-02-23 16:41:47,015 WARN [http-443-6] [confluence.extra.flyingpdf.ConfluenceExportUserAgent] getImageResource Could not retrieve image resource

2016-02-23 16:42:38,875 WARN [http-443-29] [confluence.extra.flyingpdf.ConfluenceExportUserAgent] getImageResource Could not retrieve image resource 

thanks for your help!

[Anil Jaising]

Seems like a role/permission issue, check your user role