now my squid file is not running properly.

one error is comming:
squid dead but pid file exists
squid : ERROR: Could not send signal 0 to process 1325: (3) No such
process

when i v checked the log file it is showing:

squid dead: child process 1263 exited due to signal 25

so plz help me. what is the problem
plz send the result to : rashmibb@gmail.com