I am getting an identifier expected error. What can I do? : I get this error message saying identifier expected

newIntArray3 = addValues(StackA.pop(), StackB.pop());

Can someone help me with this please?
            
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                while (!StackA.empty() && !StackB.empty()) {
    		int[] newIntArray3 = new int[4];
    @SuppressWarnings("unchecked")
                    newIntArray3 = addValues(StackA.pop(), StackB.pop());
    			int i=0;	
    			while (i<=3);
                    StackC.push(newIntArray3);
    				i++;
                }

                System.out.println("result: " + StackC.pop() + StackC.pop() + StackC.pop() + StackC.pop());
                
           }
    public void addValues() {
    int x , y = 0;
    int addValues = 0;
    addValues = x+y;
    System.out.println(addValues);
    }}

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