Using Photo Eye, I'm trying to send a message if an item doesn't come in for 10 seconds.
But I get an error.
time: 93.144454 exception: FlexScript exception: Invalid item in Conveyor.itemData[] call at MODEL:/PE1>variables/localType/clearTrigger 
What is the cause of this error?
How should I handle the error?
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If you've a long delay on the clear trigger then it's likely the item has left the conveyor system. Get around it by commenting out this line:
Conveyor.Item conveyorItem = conveyor.itemData[item];
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