Splunk db connect Oracle Wallet

[Spike91]

I am trying to generate a new input for an oracle database that contains the Wallet functionality. I followed the steps of the splunk documentation, I was able to generate the connection, but at the moment of being able to bring data from the database, it informs me the following error.
Any ideas ??

java.sql.SQLRecoverableException: IO Error: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target, connect lapse 21 ms., Authentication lapse 0 ms 

Any idea?