Loadrunner HTTP Status-Code=500 (Internal Server Error)

I try to make a login on facebook with Loadrunner Script, but I get always this:

vuser_init.c(41): Continuing after Error -26612: HTTP Status-Code=500(Internal Server Error) for "http://ift.tt/g8FRpY".

This is my request Script (Function):

web_submit_data("login.php", 
    "Action=http://ift.tt/15YkrlT", 
    "Method=POST", 
    "TargetFrame=", 
    "Resource=0",
    "RecContentType=text/html", 
    "Referer=http://ift.tt/g8FRpY", 
    "Snapshot=t30.inf", 
    "Mode=HTML", 
    ITEMDATA, 
    "Name=lsd", "Value=AVpPvlAG", ENDITEM, 
    "Name=email", "Value={FACEBOOK_LOGIN}", ENDITEM, 
    "Name=pass", "Value={FACEBOOK_PASSWORD}", ENDITEM, 
    "Name=default_persistent", "Value=0", ENDITEM, 
    "Name=timezone", "Value=-60", ENDITEM, 
    "Name=lgnrnd", "Value=013117_8ain", ENDITEM, 
    "Name=lgnjs", "Value=1392111088", ENDITEM, 
    "Name=locale", "Value=de_DE", ENDITEM, 
    EXTRARES, 

    LAST);

any help would be appreciated.