Error: "Cannot resolve attribute ‘firstView’ for component type spark.components.Application"

Hello All,

I am new to Flex Builder, ArcGIS API for flex, Mobile Mapping Apps, and not a developer I want to create a simple mobile mapping app, so followed the instructions in this page:https://developers.arcgis.com/flex/guide/tutorial-mobile-specific-application.htm

After doing all the steps, I got the following error: “Cannot resolve attribute ‘firstView’ for component type spark.components.Application”

What might be the issue here?

Thank you

Hani,

This is shown in screenshots below:

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