using two class libraries in Windows App

[TF]

I am developing a VB.net Windows Application in. I have a class 'A'
defined in a class library 'CL_A' and another class 'B' in a different
class library 'CL_B'. Class 'B' has a Public Shared member 'm_A' of
type 'A'. So it is like,

class library CL_A:
--------------------

public class A
public x as String
end class

class library CL_B: (class library CL_A is added in reference)
--------------------------------------------------------------

public class B
public shared m_A as CL_A.A
end class

Now when i try to set the shared member of class 'B' to an instance of
'CL_A.A' in following code it gives an error at compilation.

Code from Windows Application: (class libraries CL_A and CL_B are
added in reference)
--------------------------------------------------------

dim a as new CL_A.A()

CL_B.B.m_A = a

It gives following error:
error BC30311: Value of type 'CL_A.A' cannot be converted to 'CL_A.A'

Any help???

Thanks