Using CFTSTOP -kill to forcefully stop CFT results in following error when CFT is restarted by issueing CFTSTART command:
CFT pid 244880 not running.
shared memory exits for pid 244880.
CFT was not stop correctly.
can't continue. CFT not started.

This error occurs because some IPC queues, shared memory variables and semaphores are still active although the CFT is brutally stopped. These variables can be checked by using ipcs command as <ipcs | grep "login ID"> and can be removed by using ipcrm command.