Mozilla Error SEC_ERROR_UNKNOWN_ISSUER Please Help

[Seviath]

I'm getting this error

>www.google.co.id

>uses an invalid security certificate. The certificate is not trusted because the 
>issuer certificate is unknown. The server might not be sending the appropriate
>intermediate certificates. An additional root certificate may need to be 
>imported.

>Error code: SEC_ERROR_UNKNOWN_ISSUER

this happend when using mozilla only, majority website undergo this error too, not all website tough.

I has been trying delete cert8.db, adjust date, configure proxy, refresh mozilla from troubleshoot, clear cache, even reinstalling mozilla

 

[Seviath]

Nope still not solve it