I found it
The use of FlexGlobals produced this error.
I am facing a problem with Flex Builder 3.2.0 which is similar:
1046: Type was not found or was not a compile-time constant: Vector3D
1046: Type was not found or was not a compile-time constant: Matrix3D
1046: Type was not found or was not a compile-time constant: GraphicsStroke
I am not using Vector3D, Matrix3D or GraphicsStroke in my code, still I am getting this type of error while compiling.
The use of FlexGlobals produces this error. This library is used on Flex 3. Remove this Library in any library of yours you use.
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