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Puja Gupta 18Puja Gupta 18 

SSl Certification Error on public site

I am getting below error:

Error: javax.net.ssl.SSLPeerUnverifiedException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

Proceudure: In this button emails are sending with 6 attachment when we are running page direclty form developer consoler i rceived all attahmetn in email but from public site i am receving above error and not received any attachment.3  pdf is from  creating vf pages and 3 is from attachment . I have which addition permission for visiblity.
Please provide me solution.