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• Type was not found or was a compile-time constant: mx.core:IMXMLObject.
• Type was not found or was a compile-time constant: mx.rpc:IResponder.
• Type was not found or was a compile-time constant: ArrayCollection.
• Type was not found or was a compile-time constant: ChangeWatcher.
• Type was not found or was a compile-time constant: ICollectionView.
• Type was not found or was a compile-time constant: ILogger.
• Type was not found or was a compile-time constant: ILoggingTarget.
• Type was not found or was a compile-time constant: Sort.

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Create a new Flex project. Create a folder named libs in that project and copy the {{ <font size=2>FlexUnit4.swc</font>}} file into the new folder.

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