Something is wrong with your current levelUp method in your PlayerAssistant Class.
Try removing the first portion of the method and replacing with mine respectively.
Code:
public void levelUp(int skill) {
int totalLevel = (getLevelForXP(c.playerXP[0])
+ getLevelForXP(c.playerXP[1]) + getLevelForXP(c.playerXP[2])
+ getLevelForXP(c.playerXP[3]) + getLevelForXP(c.playerXP[4])
+ getLevelForXP(c.playerXP[5]) + getLevelForXP(c.playerXP[6])
+ getLevelForXP(c.playerXP[7]) + getLevelForXP(c.playerXP[8])
+ getLevelForXP(c.playerXP[9]) + getLevelForXP(c.playerXP[10])
+ getLevelForXP(c.playerXP[11]) + getLevelForXP(c.playerXP[12])
+ getLevelForXP(c.playerXP[13]) + getLevelForXP(c.playerXP[14])
+ getLevelForXP(c.playerXP[15]) + getLevelForXP(c.playerXP[16])
+ getLevelForXP(c.playerXP[17]) + getLevelForXP(c.playerXP[18])
+ getLevelForXP(c.playerXP[19]) + getLevelForXP(c.playerXP[20]));
sendFrame126("Total Lvl: " + totalLevel, 3984);