JSON data in Web_custom_request- Vugen and getting Error -26631: HTTP Status-Code=400 (Bad Request)

Hi,

I have prepared script but when i am trying to replay the script giving error message as

Action.c(125): Error -26631: HTTP Status-Code=400 (Bad Request) for “http://XXXXXXXXX.net/MicroStrategyV10/servlet/taskProc?taskId=XXXX......

And my script is

web_custom_request(“taskproc”,
“URL=http://XXXXXXXXX.net/MicroStrategyV10/servlet/taskProc?taskId=XXXX....... ”,
"0.00000011a5...................................................................",
"New*_York.pxs*_1*..............................................................",
“Method=POST”,
"TargetFrame=",
“Resource=0”,
“RecContentType=application/json”,
"Referer=http://XXXXXXXXX.net/MicroStrategyV10/servlet/XXXXXX...................",
"Snapshot=t4.inf",
“Mode=HTTP”,
"EncType=",
EXTRARES,
/* xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
*/
LAST);

Plys help me....