I am using Vugen 12.1, while trying to use the web_set_user function it gives an error

Hi All, 

I have used the Web_set_user function, while  I do a replay, it still gives me the same error 

Error -26547: Authentication required, please use web_set_user, e.g. web_set_user("domain\\user", "password", "host:port"); [MsgId: MERR-26547]
Action.c(57): Error -26630: HTTP Status-Code=401 (Unauthorized) for "http://10.135.8.193:8080/jws/nims-welcome-page.jsp?__ts=1428386043

Am I using the function in the wrong way.  I have declared the function in the start of the script : 

I have given an example , this is how i have declared the function. 

Action()
{
web_set_user("in\\omt", "omt", "nvmbd01vsr:8080");
web_url("10.135.xxxx:8080",
"URL=http://10.135.xxx:8080/",
"Resource=0",

P.S. this thread has been moved from Community Feedback & Suggestions to LoadRunner Support Forum. - Hp Forum moderator