web_coustom_request ("usermanagment") Error

Error i am Seeing this error ar line 429, I have no idea what to do next.

Action.c(429): Error -26612: HTTP Status-Code=500 (Internal Server Error) for "https://3.11.22.34:8443/mp/MpApp/UserManagement" [MsgId: MERR-26612]

code at line 429 is as follows.

web_custom_request("UserManagement", 
        "URL=https://3.11.22.34:8443/mp/MpApp/UserManagement", 
        "Method=POST", 
        "Resource=0", 
        "RecContentType=application/json", 
        "Referer=https://3.11.22.34:8443/mp/", 
        "Snapshot=t51.inf", 
        "Mode=HTTP", 
        "EncType=text/x-gwt-rpc; charset=utf-8", 
        "Body=7|0|8|https://3.11.22.34:8443/mp/MpApp/|FFAF1B96015A8935AB52B33E3AD3806B|com.ge.trans.mp.samp.ums.rpc.UserManagement|getRoleInformation|com.ge.trans.mp.samp.ums.model.RoleListData/1626123054|java.util.ArrayList/4159755760|com.ge.trans.mp.samp.ums.model.UserRecord/751224943||1|2|3|4|1|5|5|6|0|7|6|0|0|0|8|0|0|8|0|", 
        LAST);

can anyone help with this.??

Thanks in advance!