How to modification task with assignee multi instance

[qhanm]

Hello!

I have a problem I need help with.

When I modification form “Task 02” to “Task 01”. I get 1 error message (image 2)

How to fix this error.

Thanks

See below 2 image

[Niall]

Can you upload the model?

[qhanm]

My model
flow-test-zoom.bpmn (8.6 KB)