How to properly organize the work of the insert function?

Question

Python

When testing, the following error occurs:

def insert(self,item,pos):
        current = self.head
        found = False
        count = 0
        while not found:
            if count == pos-2:
                found = True
            else :
                current = current.getNext()
                count = count + 1
        temp = Node(item)
        temp.setNext(current.getNext())
        current.setNext(temp)