How to do a search on item record?

Hi,

  I need to get the internal id of an item whose itemname is a given text.Is there a way to do this.I did a search for this but I get an error.

Error: SSS_INVALID_SRCH_FILTER An nlobjSearchFilter contains invalid search criteria: itemid.

The code is shown below.Is there anything I am missing in the code?

    var cols = new Array();
    cols[0] = new nlobjSearchColumn('internalid');
    cols[1] = new nlobjSearchColumn('itemid'); 

    var filtersArr = new Array();
    filtersArr[0] = new nlobjSearchFilter('itemid', null, 'is', revisionTypeText , null);

    var searchResultArr = nlapiSearchRecord('item', null, filtersArr, cols);

Thanks,
Iby