Operations between types "struct _object*" and "int" is not allowed

The part of the code that is causing this error is:

newobj = STRINGLIB_NEW(NULL, STRINGLIB_LEN(self));

I have tried to undefine the variable and malloc. I am not sure how to correct the error. Also I am compiling this with the ILE C AS400 compiler What do I need to do to fix it? The following is the entire code.....

/* NOTE: this API is -ONLY- for use with single byte character strings. */
/* Do not use it with Unicode. */

#include "bytes_methods.h"
#include "structmember.h"
#include "stdlib.h"
#include "Python.h"
#include "stdio.h"
#include "string.h"


static PyObject*
stringlib_isspace(PyObject *self)
{
const char* sum = (const char*)malloc(STRINGLIB_STR(self));
    return _Py_bytes_isspace(sum, STRINGLIB_LEN(self));
}

static PyObject*
stringlib_isalpha(PyObject *self)
{
const char* sum = (const char*)malloc(STRINGLIB_STR(self));
    return _Py_bytes_isalpha(sum, STRINGLIB_LEN(self));
}

static PyObject*
stringlib_isalnum(PyObject *self)
{
const char* sum = (const char*)malloc(STRINGLIB_STR(self));
    return _Py_bytes_isalnum(sum, STRINGLIB_LEN(self));
}

static PyObject*
stringlib_isdigit(PyObject *self)
{
const char* sum = (const char*)malloc(STRINGLIB_STR(self));
    return _Py_bytes_isdigit(sum, STRINGLIB_LEN(self));
}

static PyObject*
stringlib_islower(PyObject *self)
{
const char* sum = (const char*)malloc(STRINGLIB_STR(self));
    return _Py_bytes_islower(sum, STRINGLIB_LEN(self));
}

static PyObject*
stringlib_isupper(PyObject *self)
{
const char* sum = (const char*)malloc(STRINGLIB_STR(self));
    return _Py_bytes_isupper(sum, STRINGLIB_LEN(self));
}

static PyObject*
stringlib_istitle(PyObject *self)
{
const char* sum = (const char*)malloc(STRINGLIB_STR(self));
    return _Py_bytes_istitle(sum, STRINGLIB_LEN(self));
}


/* functions that return a new object partially translated by ctype funcs: */

static PyObject*
stringlib_lower(PyObject *self)
{
char* sum1;
const char* sum = (const char*)malloc(STRINGLIB_STR(self));
    PyObject* newobj;
    newobj = STRINGLIB_NEW(NULL, STRINGLIB_LEN(self));
    sum1 = (char*)malloc(STRINGLIB_STR(newobj));
    if (!newobj)
            return NULL;
    _Py_bytes_lower(sum1, sum,
                 STRINGLIB_LEN(self));
    return newobj;
}

static PyObject*
stringlib_upper(PyObject *self)
{
char* sum1;
const char* sum = (const char*)malloc(STRINGLIB_STR(self));
    PyObject* newobj;
    newobj = STRINGLIB_NEW(NULL, STRINGLIB_LEN(self));
    sum1 = (char*)malloc(STRINGLIB_STR(newobj));
    if (!newobj)
            return NULL;
    _Py_bytes_upper(sum1, sum,
                 STRINGLIB_LEN(self));
    return newobj;
}

static PyObject*
stringlib_title(PyObject *self)
{
char* sum1;
char* sum = (char*)malloc(STRINGLIB_STR(self));
    PyObject* newobj;
    newobj = STRINGLIB_NEW(NULL, STRINGLIB_LEN(self));
    sum1 = (char*)realloc(sum,STRINGLIB_STR(newobj));
    if (!newobj)
            return NULL;
    _Py_bytes_title(sum1,sum,
                 STRINGLIB_LEN(self));
    return newobj;
}

static PyObject*
stringlib_capitalize(PyObject *self)
{
char* sum1;
char* sum = (char*)malloc(STRINGLIB_STR(self));
    PyObject* newobj;
    newobj = STRINGLIB_NEW(NULL, STRINGLIB_LEN(self));
    if (!newobj)
            return NULL;
    sum1 = (char*)realloc(sum,STRINGLIB_STR(newobj));
    _Py_bytes_capitalize(sum1, sum,
                      STRINGLIB_LEN(self));
    return newobj;
}

static PyObject*
stringlib_swapcase(PyObject *self)
{
char* sum1;
char* sum = (char *)malloc(STRINGLIB_STR(self));
    PyObject* newobj;
    newobj = STRINGLIB_NEW(NULL, STRINGLIB_LEN(self));
    sum1 = (char*)realloc(sum,STRINGLIB_STR(newobj));
    if (!newobj)
            return NULL;
    free (sum);
    _Py_bytes_swapcase(sum1,sum,
                    STRINGLIB_LEN(self));
    return newobj;
}