Tatsavitur,
It looks like you have not specified a valid SID for the tool to connect to. SQLPLUS is returning that error basically saying "I don't know what I'm supposed to be connecting to." If you don't know your database SID, you can find it in \SymantecDLP\Protect\config\jdbc.properties in the connection string. This should at least help you track down what you're trying to connect to.