Why does CFSchedule fail with a null pointer error

I am running CFSchedule to get my scheduled task added to the admin and no matter what I do it keeps coming back with the message "The system has attempted to use an undefined value, which usually indicates a programming error, either in your code or some system code. Null Pointers are another name for undefined values." I thought this was working code, and no matter what I do I can't figure it out. Here is my code, can someone tell me what I'm missing?

<cfschedule action="update"
    task="LoadTeeTimes" 
    operation="HTTPRequest"
    url="https://xxxxxxxxxx.com/Admin/AdminTeeTimesFunction.cfm"
    startDate="4/1/2021"
    endDate="11/30/2021"
    startTime="4:30 AM" 
    endTime="9:30 PM"
    interval="3600" 
    resolveURL="No"
    publish="No"
    result="res">