Adobe flash buider (flex4): Error #2025 or Error: addChild() is not available in this class. Instead, use addElement()?

I ran into the same problem using that tutorial for Flex 4. I did the same thing as you and used the component for the Main Canvas. However the tutorial uses a , the solution I found was to change the Main Canvas from an to an .

The problem seems to be embedding an Application within an Application.

The code on that link was written using the flex 3.5 sdk or below. You are using the new flex 4 sdk ( which is the default for Flash Builder ). You can do the following: 1.

Step into the code do any necessary changes to make it work for flex 4 sdk. 2. Setup a new project using the flex 3 sdk ( select "Use a specific SDK" and choose the Flex 3 from the dropdown box in the "New Project" window) I would suggest going for the second option, make it work and once you've stepped a little deeper into flex 4 you can do the 1st option.

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