[Error] ISO C++ forbids comparison between pointer and integer [-fpermissive]

Выдало ошибку в коде функции:


intCom getDo(int i, string scr, int last){
intCom rtr;
bool end = 0;

size_t argLast = last;
rtr.argcnt = 0;

rtr.fullcom = copyTextBetweenDots(scr, last).res;
rtr.last = copyTextBetweenDots(scr, last).lst;

/*
for(int j = 0; copyTextBetweenQD(scr, argLast).isEnd != 1; j++){
rtr.a[j].arg = copyTextBetweenQD(scr, argLast).res;
rtr.argcnt = j;
}*/

//if(i > 0)for(int j = 1; j < rtr.fullcom.length(); j++) rtr.fullcom[j - 1] = rtr.fullcom[j];

for(int j = 0; j < rtr.fullcom.length(); j++){
if(rtr.fullcom[j] != " "){ end = 1; rtr.fullcom[j] = rtr.body[j]; } //Здесь эта ошибка
if(rtr.fullcom[j] == " " && (end == 1)) j = rtr.fullcom.length();

}

return rtr;
}