I found this under zone, external dependencies, xstring, line 1440 as error indicates.
Code:
reference operator[](size_type _Off)
{ // subscript mutable sequence
#if _ITERATOR_DEBUG_LEVEL == 2
if (this->_Mysize <= _Off)
_DEBUG_ERROR("string subscript out of range");
#elif _ITERATOR_DEBUG_LEVEL == 1
_SCL_SECURE_VALIDATE_RANGE(_Off < this->_Mysize);
#endif /* _ITERATOR_DEBUG_LEVEL == 2 */
return (_Myptr()[_Off]);
}
Not sure what it means. Hah! Sorry for spamming message board with posts.