flume-uncaught exception

Hi flumers,

I deleted all files and directories which flume wrote in hdfs, and used new
spooldirectory source, and why i am facing the error "uncaught exception
spooldirectorysource thread" when i starts flume? when I checked ps -ef |
grep flume*, there are so many flume processes are running, I killed all
with kill -9 <pid>, but why these many processes not killed by stopping
flume with ctrl+c, what is the procedure to stop flume when i started with
# flume-ng agent -c /etc/flume-ng/conf -f /etc/flume-ng/conf/flume.conf -n
<agent name> -Dflume.root.logger=DEBUG,console,

I used "useStrictSpooledFilePolicies = false" line also in config file.

please help me