Can not call method by Telerik

Hi all,

Here is the issue need your support:

I Added a new class, the method in the class will invoke "log", "find", i instance the class and use it in other class, it comes an error that "InnerException:
System.NullReferenceException: Object reference not set to an instance of an object.
 at ArtOfTest.WebAii.Design.BaseWebAiiTest.get_Log()"

So i want to confirm whether it is possible that we can call the log and find method in this way? attached the example code

Public Class A Inherits BaseWebAiiTest  
#Region "[ Dynamic Pages Reference ]"
.....
#End Region
Public function testA（）
Dim bClass as B
bClass = NEW B
bClass.testB(par1)
End Function
End Class

Public Class B Inherits BaseWebAiiTest  
#Region "[ Dynamic Pages Reference ]"
.....
#End Region
Public function testB（par1 as String）
log.WriteLine(par1）
find.By.....
End Function
End Class