Express List Search Error

If I enable search I get the following PHP error. The list block works fine without search enabled.

An unexpected error occurred.

Call to undefined method Concrete\Attribute\Express\Controller::searchForm()

Seems very basic so I must be doing something wrong. Can anyone help?

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theana27 replied on at Permalink Reply
It's an old post, but I had same error. I found that it happened when use express attribute for associations. Because entry list you can't search by associations.