add error code
add error code

jonesgithub/IAPHelper,thanhtrdang/IAPHelper,dxd214/IAPHelper,crazypoo/IAPHelper,pengleelove/IAPHelper,wjszf/IAPHelper,chengkaizone/IAPHelper,xiaobodu/IAPHelper,BlessNeo/IAPHelper,edison9888/IAPHelper,hanhailong/IAPHelper,yzpniceboy/IAPHelper,msdgwzhy6/IAPHelper,KimBin/IAPHelper,saturngod/IAPHelper,RyanTech/IAPHelper