Package in AS2.0 Problem

programming flash
1

This is my problem.
I have classes witch resides in this package :com.network.interface_as.
When I try to load one class from that package in another class in the same package like this:

import com.network.interface_as.SomeClass_A
class com.network.interface_as.SomeClass_B{
    private var class_A:SomeClass_A;
public function(){
    class_A = new SomeClass_A();
}
}

I get error message that “class com.network.interface_as.SomeClass_A could not be loaded”.
What am I doing wrong.