Ladies and gentlemen, I am newbie to Oracle BI. I installed Oracle 10g DB and OBIEE 10G on my Pc to do some practice using OBE. I am stuck trying to establish the Connection pool. First, I received the ORA-12541 error message - No listener. I then tried to start up the listener using the cmd prompt. Then came this response: LSNRCTL> start Starting tnslsnr: please wait... TNS-12560: TNS: protocol adapter error TNS-00530: Protocol adapter error Can someone help? What should I do to fix this ?