Error message shown when same Function is called again

There are three functions -

function A()

{

 

}

***********************************************

function B()

{

A()

}

***********************************************

function C()

{

  A()

  B()

}

**********************************************

Now when function C() is called the function A() works for the first time but the control passes to function B() which is also called properly...but in function B() when function A() is called -  Error message is shown at function A() - "Object doesn't support this property or method"............................function A() and B() are in same unit while function C() is in different unit...I am using C# scripting language and there is no circular reference.

 

May I request you to please help me to sort out this issue?

 

Thanks in Advance