How can I debug an Actionscript project in Flex builder?

I am trying to use Flex builder for the first time in years. I haven't used the "Run Application" option bef开发者_开发问答ore, and when I do that now it tells me "Errors exist in required projects" and whether I should proceed. I would like to debug those errors.

Does anyone know how I can do that?

PS: When I click the "Debug" button, it does exactly the same thing. I don't see error output in the console views.

Ensure the Problems view is open (Window -> Show View -> Problems).

That will show you what compilation errors exist that need to be fixed before you can launch the project.

Yes, you will not be able to launch the program until you fix the compile-time errors.

Open the 'Problems' pane, fix compile errors, and then the program will run.