i already have c3p0-0.9.1.jar in my path but why i still getting this error

Aug 19, 2008 8:19:00 PM com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector run
WARNING: com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector@6ada77 -- APPARENT DEADLOCK!!! Creating emergency threads for unassigned pending tasks!
Exception in thread "Timer-3" java.lang.NoClassDefFoundError: com/mchange/v2/io/IndentedWriter
at com.mchange.v2.async.ThreadPoolAsynchronousRunner.getMultiLineStatusString(ThreadPoolAsynchronousRunner.java:281)
at com.mchange.v2.async.ThreadPoolAsynchronousRunner.access$100(ThreadPoolAsynchronousRunner.java:36)
at com.mchange.v2.async.ThreadPoolAsynchronousRunner$DeadlockDetector.run(ThreadPoolAsynchronousRunner.java:616)
at java.util.TimerThread.mainLoop(Timer.java:512)
at java.util.TimerThread.run(Timer.java:462)