Script fails in Performance Center, but works fine in VUGEN

Hi,

I have created a script with web_reg_save_param_regexp to capture group 2.

The scripts works fine in the Vugen, but fails in the Performance Center.

web_reg_save_param_regexp is given below

web_reg_save_param_regexp(
		"ParamName=Asset_ID_List",
		"RegExp=\"assetName\":\"(.*?)\",\"assetId\":\"(.*?)\"",
		"Ordinal=All",
		"Group=2",
		SEARCH_FILTERS,
		"IgnoreRedirections=No",				
		"RequestUrl=*/showSearchResult*",			
		LAST);

The error is 

AL_Permission_Template.c(144): web_reg_save_param_regexp started [MsgId: MMSG-26355]
AL_Permission_Template.c(144): Error -26396: The "Group=2" argument (number 4) is unrecognized or misplaced [MsgId: MERR-26396]
End auto log messages stack. [MsgId: MMSG-10544]

What could be the problem, am I missing anything here?

Thanks,

Anand