Cannot compile Library project in Flash builder 4: Unable to locate specified base class

I am migrating from Flex builder 3 to Flash builder 4, during that process I found that Flash builder could'nt compile Flex Library projects which contains components in the form of mxml files. Compiler throws "Unable to locate specified base class".
I have narrowed it down to by creating a flex library project named test library, below its screenshot with its package structure
ControlA is based on componentA
when i compile this project, mxml compiler throws this error
Unable to locate specified base class 'components.componentA' for component class 'ControlA'.
I cannot upload project code because file uploads are disabled on this forum so I am going to paste the code for both componentA and controlA
componentA
<?xml version="1.0" encoding="utf-8"?>
<mx:Canvas xmlns:mx="http://www.adobe.com/2006/mxml" xmlns:local="*" width="400" height="300">
</mx:Canvas>
ControlA
<?xml version="1.0" encoding="utf-8"?>
<components:componentA xmlns:mx="http://www.adobe.com/2006/mxml" xmlns:components="components.*" width="400" height="300">
</components:componentA>
To further test it, I have made another library project with same package structure using pure AS3, and it compiled without errors

It might be this happens and other errors if you forget to Run Flash Builder 4.5 Buritto and startup the other version FB4.
It uses the same project listings and that can be confusing since you're not expecting the old version to be aware of new Buritto (MobileApplications) projects you added (thinking) only to the BETA version installed elseware no doubt.
Well it might not be your problem but worthy of noting for other's I'm sure.
Otherwise you've double checked you're using SDK 4.5 Hero with it too! right?

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Cannot compile Library project in Flash builder 4: Unable to locate specified base class

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