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sawanya khomsan avatar image
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sawanya khomsan asked Jason Lightfoot commented

An invalid task has been encountered - involved is null

How do I take corrective action?

1689794027239.png

FlexSim 22.1.4
task sequencenullinvalid taskinvolved22d
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Julie Weller avatar image Julie Weller commented ·
Hi @sawanya khomsan! That's usually due to a missing or incorrect name in the process flow for your unload task sequence. It's really tricky to say definitively what went wrong without seeing your model. If it's proprietary you can toggle this question to private so only the FlexSim support team can see it.
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1 Answer

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Julie Weller answered Jason Lightfoot commented

The issue seems to be there is no station selected to unload to:

1689794822869.png

If you choose a place that should fix it


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sawanya khomsan avatar image sawanya khomsan commented ·

I fixed it but got a new problem.1689795405794.png

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1689795405794.png (38.0 KiB)
Julie Weller avatar image Julie Weller sawanya khomsan commented ·
I think on that one you left the load station as Item Container right? The issue might be that you need to choose an actual station to load from...
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Julie Weller avatar image Julie Weller Julie Weller commented ·
If that doesn't help will you post your model again?
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sawanya khomsan avatar image sawanya khomsan commented ·

Input model 1_2.fsm

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input-model-1-2.fsm (2.7 MiB)
sawanya khomsan avatar image sawanya khomsan sawanya khomsan commented ·

my latest model

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Jason Lightfoot avatar image Jason Lightfoot ♦♦ sawanya khomsan commented ·

The problem is that you created all the tasks sequences to transfer the items on the CB transporter, but some of them are taken out by Transporter2 (and destroyed) so the task sequence is invalid when the CB comes to move the item.

It's not good model hygiene to mix methods like this.

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