Opening popup screen in mobile device

I have a popup screen to select company name if the default user has not been selected already. It runs Ok in desktop but when I run in Mobile (iPhone) it says, no such screen…

Is there any suggestions to resolve this?

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What do you mean saying “popup screen”? Could you share XML-descriptor of the parent screen?
Which value has the “Agent” property of the screen which could not be opened? It should be empty if you want the same screen to work on all devices.