Error --memory violation :Exception ACCESS_VIOLATION received

I am blocked and would appreciate if somebody help.I have a vsuer_init.c along with action and end script which runs fine with manual test on same load but with Loadrunner automation in our frameowkr it throws error like this

vuser_init.c(3): Error: C interpreter run time error: vuser_init.c (3):  Error -- memory violation : Exception ACCESS_VIOLATION received.

The script is like this

vuser_init()
{
lr_save_string(lr_get_attrib_string ("host1"), "host1");
return 0;
}

host1 is argument name under additional attributes which contains ip address