Error on sending Email - timestamp check failed

Hello,
sometimes when i am sending an email via backendless i get this error message as the backendless fault message :

sun.security.validator.ValidatorException: PKIX path validation failed: java.security.cert.CertPathValidatorException: timestamp check failed

it is not a usual case , but sometimes it just happen.
is there any solution for that ?

Hi Gehad,
Thanks for your feedback.
Currently, it is hard to realize what is the cause of the error by the description that you gave.
Could you please provide us some example to reproduce this issue.
Regards Ilya