Can anybody please kindly explain why there are runtime errors

class Solution {

public:

vector<int> searchRange(vector<int> &A, int target) {

int start, end, mid;

vector<int>range;

```
// find left bound;
start = 0;
end = A.size() - 1;
while (start + 1 < end) {
mid = start + (end - start) / 2;
if (A[mid] == target) {
end = mid;
} else if (A[mid] < target) {
start = mid;
} else {
end = mid;
}
} // while loop
if (A[start] == target) {
range[0] = start;
} else if (A[end] == target) {
range[0] = end;
} else {
range[0] = range[1] = -1;
return range;
}
// find the right bound
start = 0;
end = A.size() - 1;
while (start + 1 < end) {
mid = start + (end - start)/2;
if (A[mid] == target) {
start = mid;
} else if (A[mid] < target) {
start = mid;
} else {
end = mid;
}
} // while loop
if (A[end] == target) {
range[1] = end;
} else if (A[start] == target) {
range[1] = start;
} else {
range[0] = range[1] = -1;
return range;
}
return range;
}
```

};

'''