The "display size" order attribute may not be specified for this order message?

I have been trading with IB for nearly twenty years and use the classic TWS, and when I was trying to put a futures stop order in late this afternoon (before 4:14 EST), I could not place the order. Instead, I received the following message: the "display size" order attribute may not be specified for this order.

I could not find the message in the long index of message codes.

I have tried to configure the order attributes section.

Nothing seems to work.

I am not trying to put in a complicated order: merely a buy stop order slightly above the market No conditions. I don't even have the "display size" on my quote screen.

What should I do? Thank you.
 
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