Unable to upload testing result in Katalon Analytics

During upload of testing result to katalon analytics , i am getting message as

“sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target” .
Although i am able to access sites over the internet after configuring the proxy in katalon.

Please help
Regards
ASISH KUMAR GUPTA