trivia question

[Ginger Booth]

Dear gang,
    How do you evade these warnings/properly drop these things:
For each run, think I need to do something like:

    // drop prior values
    [simActions drop];
    [simSchedule drop];
    [displayActions drop];
    [displaySchedule drop];
    [swarmPlan drop];
    [swarmActivity drop];

compiler says like:

    main.m:93: warning: multiple declarations for method `drop'
    ../swarm/include/defobj.h:43: warning: using `-(void)drop'
    Res.h:16: warning: also found `-drop'
    Mcr.h:20: warning: also found `-drop'

Then when it runs (crashes):

    *** event raised for error: SourceMessage
    *** function: _i_Schedule_c__drop(), file: ActionPlan.m, line: 444
    cannot drop action plan still referenced by an uncompleted activity
    *** execution terminating due to error

Do I need to drop them?  Are they big?  I do want everything re-zeroed.

Thanks,
    Ginger