"Couldn't store key: SYSTEM ERROR" error when running c program under cgi-bin

[unagi2020]

When I run following program from commandline on CentOS 6.4, I get the 
expected results but when I run it as Apache cgi, I error Couldn't store 
key: SYSTEM ERROR error. I am running Memcached, Apache and program through 
the same user. 
What could I be doing wrong..

#include<stdio.h>
#include<string.h>
#include <libmemcached/memcached.h>

int main(int argc, char **argv) {
    memcached_server_st *servers = NULL;
    memcached_st *memc;
    memcached_return rc;

    char *key= "keystring";
    char *value= "keyvalue";
    char *key1= "keystring1";
    char *value1= "keyvalue1";

    memc= memcached_create(NULL);
    servers= memcached_server_list_append(servers, "localhost", 11211, &rc);
    rc= memcached_server_push(memc, servers);

    printf("Content-Type: text/plain;charset=us-ascii\n\n");

    if (rc == MEMCACHED_SUCCESS)
        printf("Added server successfully\n");
    else
        printf("Couldn't add server: %s\n",memcached_strerror(memc, rc));

    memcached_server_free(servers);

    rc= memcached_set(memc, key, strlen(key), value, strlen(value), 
(time_t)0, (uint32_t)0);

    if (rc == MEMCACHED_SUCCESS)
        printf("Key stored successfully\n");
    else
    printf("Couldn't store key: %s\n",memcached_strerror(memc, rc));

    char *keys[]= {"keystring", "keystring1"};
    size_t key_length[]= {9, 10};
    unsigned int x;
    uint32_t flags;

    char return_key[MEMCACHED_MAX_KEY];
    size_t return_key_length;
    char *return_value;
    size_t return_value_length;

    rc= memcached_mget(memc, keys, key_length, 2);

    x= 0;

 if (rc == MEMCACHED_SUCCESS)
  {
        while ((return_value= memcached_fetch(memc, return_key, 
&return_key_length,
                                          &return_value_length, &flags, 
&rc)))
        {
            if (rc == MEMCACHED_SUCCESS)
            {
              printf("Key %s returned %s\n",return_key, return_value);
            }
        }
    }


    memcached_free(memc);
    return 0;
}

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