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How can catch the dhtmlXgrid error ?

The inner errors can be catched in next manner

function myErrorHandler(type, desc, erData){
    //custom code can be placed here
    return false;
}
dhtmlxError.catchError("LoadXML", myErrorHandler);

The array contains additonal data related to error
    erData=[xmlHttpRequest , object]

First element - xmlHttpRequest object, which contain all data requested
from server.
Second element - dhtmlx object, component which throw error while
loading.

You can get any additional error info by checking xmlHttpRequest
properties (xmlHttpRequest.responseText for example )