Problems with pointers

[GnG]

Hi all,
I don't know much about pointers, so please, what am I doing wrong?!

I have a class B:

vector<int> lstInt;

void run() {
 // here all my thread process
}

string test() {
 return "c++";
}

vector<int> getList() {
  return lstInt;
}

And a class A:

classB *myclass;

// if I try:
myclass->test();
// it returns me the string "c++"

//but if I do:
myclass->getList();
// it returns me exception (No source available for "__kernel_vsyscall() at 0x12d422") and kill my software 

What is wrong?!
=/

Tnks all.

[Skillless]

myclass points to nothing, you should do something like...
myclass = new classB;

myclass = &aclassBvariable;

[GnG]

hun,

myclass have a instance.
The problem is that i can't access any variable of class B from class A, I tried to do something with wait and notify, but the same error occurred, the same error (No source available ....).

I really don't know what could be the problem.

=/

[mIXpRo]

Could you post the complete two classes