Unable to deploy "Parameters must include randomize=true to use a seed."

I cannot preview or deploy my form.
It says
"Your form cannot be deployed because it contains errors:

Unexpected KoBoCAT error 400: b’{“detail”:“Parameters must include randomize=true to use a seed.”}’


I don’t use a seed at all. Why does this error happen?

Often, using the search function of this forum can provide help and examples, e.g.

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Thank you.

I couldn’t find the reason but I found some questions whose parameters show “seed=” in XLS.
After I deleted those questions, that error disappeared.

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@ykanno, :clap: :heart: :partying_face: