Simple Binary Tree Delete with 2 Child Problem

[deepecstasy]

So Im creating Simple Binary Tree, not BST. Im having problem in deletewith 2 child.
Method for deletion is DELETE WITH COPYING.

After deleteing, when I traverse the tree, it shows run time error,
Unhandled exception at 0x008B5853 in binarytree.exe: 0xC0000005: Access violation reading location 0xFEEEFEEE.

Here is the function:

void BinaryTree<mytype>::deletewithTwoChild(BTNode<mytype> *temp)	//temp is the node which is to be deleted.
{
	BTNode<mytype> *father = findfather(temp, root);	//found address of father of temp node & stored it in pointer
	BTNode<mytype> *leaf = temp;	//created a copy of temp node

	/////CASE 1 (for predecessor)
	if(temp==root || father->left==temp)	//if father is left child of its own father then
	{
		leaf = leaf->left;	//move leaf 1 time left
		while(leaf->right!=0 && leaf->left!=0)	//until leaf reaches the last node of tree which has no child
		{
			leaf = leaf->right;	//move leaf 1 time to right
		}
		mytype var = leaf->key_value;	//created a template variable to store leaf's key
		leaf->key_value = temp->key_value;	//assigning temp's key to leaf
		temp->key_value = var;	//assigning leaf's key to temp
		deleteWithNoChild(leaf);	//finally delete the last node (which is the given node for deletion) after swap 
	}
	/////CASE 2 (for successor)
	else if(father->right==temp)	//if father is right child of its own father
	{
		leaf = leaf->right;	//move leaf 1 time right
		while(leaf->right!=0 && leaf->left!=0)	//until leaf reaches the last node of tree which has no child
		{
			leaf = leaf->left;	//move leaf 1 time to right
		}
		mytype var = leaf->key_value;	//created a template variable to store leaf's key
		leaf->key_value = temp->key_value;	//assigning temp's key to leaf
		temp->key_value = var;	//assigning leaf's key to temp
		deleteWithNoChild(leaf);	//finally delete the last node (which is the given node for deletion) after swap
	}
}

Data Set I m using:

                       30
                      /  \
                     20  80
                    /   /  \
                  10  40    120
                       \     / \ 
                      60  100 140
                      / \     /  \
                    50  70   130 150

Im trying to delete node 80, 60, 120, 140 when the run time error pops up. Plz help :((