Java Practice It || 4.15 sumTo || for loop, errors for loop, method basics, return

Problem:

Question:
What is wrong with the following sumTo method, which attempts to add all numbers from 1 to a given maximum? Correct the code so that it properly implements this behavior. For example the call of sumTo(5) should return 1+2+3+4+5 = 15. You may assume that the value passed is at least 1.