Database Software

I am configuring Golden Gate for MySQL and when i start extract it says extract started successfully but when i see its log file then i see this


2011-03-04 01:55:10 ERROR OGG-00146 VAM function VAMInitialize returned unexpected
result: error 600 - VAM Client Report <CAUSE OF FAILURE : Log index file
does not exist,please check if binary logging is enabled - /var/lib/mysql//Hassan-bin.index
WHEN FAILED : While initializing binary log configuration
WHERE FAILED : MySQLBinLog Reader Module
CONTEXT OF FAILURE : No Information Available!>.

2011-03-04 01:55:10 ERROR OGG-01668 PROCESS ABENDING.


then i changed MySQL bin log file name format to what it is saying and restarted MySQL service and again tried to start extract process. Now I am getting this error which is not clear to me


011-03-04 23:13:14 ERROR OGG-00146 VAM function VAMInitialize returned unexpected
result: error 600 - VAM Client Report <CAUSE OF FAILURE : Position time is
prior then earliest time available in the log : Earliest time available in the
log is 2011-03-04 23:08:25
WHEN FAILED : SetInitialPosition by time stamp
WHERE FAILED : MySQLBinLog Reader Module
CONTEXT OF FAILURE : No Information Available!>.

2011-03-04 23:13:14 ERROR OGG-01668 PROCESS ABENDING.


any one can help me out why this is occuring