selected row remove on infotable

I wanna remove selected row  on infotable. 

The delete query inputs the info table and query. so I made Service to bring property into the infotable.

And I used eqfilter was used to select the value in the infotable.

ex) getService : A service that brings property into the infotable.

      primary_field : A field I wanna delete 

      1 : selected row on primary_field value

var tray = me.getSevice({
thingName: thingName 
});

var traydelete = {
fieldName: "primary_field " ,
isCaseSensitive: undefined,
t: tray,
value: "1"  
};

var td = Resources["InfoTableFunctions"].EQFilter(traydelete);

var params = {
t: tray, /* infotable */
query: traydelete /* query */
};

var result = Resources["InfoTableFunctions"].DeleteQuery(params);

but I get Output : Wrapped java.lang.NullPointerException

Infotable, there is a "primary_field" and values "1"

Somebody help me! Or tell me how to delete another one.

Would it be ok, tell me how to update that selected row.

Thank you!