Error Recording Using Gatling Tool

Hi, i am getting warnings in console as below:

11:04:03.811 [WARN ] i.n.c.DefaultChannelPipeline - An exceptionCaught() event was fired, and it reached at the tail of the pipeline. It usually means
the last handler in the pipeline did not handle the exception.
javax.net.ssl.SSLException: Received fatal alert: bad_certificate

11:06:03.864 [WARN ] i.n.c.DefaultChannelPipeline - An exceptionCaught() event was fired, and it reached at the tail of the pipeline. It usually means
the last handler in the pipeline did not handle the exception.
javax.crypto.AEADBadTagException: Tag mismatch!

My Configurations:
HTTPS Mode - Self Signed Cerificate
HTTPS Proxy - Localhost 8000
Accesing application site using VPN Connection
Gatling Version - 3.0.3
Added exception certificate in firefox browser (Using firefox)

If i continue recording with these warnings, and at the ened open scala file, it seems nothing is recorded.

Please help me knowing whats wrong,

Thanks in advance,
Mohini Nemade