Error While Initializing two Group By Grid

[logibricks]

pqgrid.min.js:16 Uncaught TypeError: Cannot read property 'length' of undefined
    at Function.shiftRC (pqgrid.min.js:16)
    at _pq.cFormulas.onDataReadyDone (pqgrid.min.js:17)
    at t.(anonymous function).(anonymous function).<anonymous> (http://localhost:63220/PqGridPro/pqgrid.min.js:16:30897)
    at o (pqgrid.min.js:9)
    at t.(anonymous function).(anonymous function).i._trigger (http://localhost:63220/PqGridPro/pqgrid.min.js:9:7633)
    at t.(anonymous function).(anonymous function).a.refreshDataFromDataModel (http://localhost:63220/PqGridPro/pqgrid.min.js:10:17779)
    at t.(anonymous function).(anonymous function).a.refreshView (http://localhost:63220/PqGridPro/pqgrid.min.js:10:21420)
    at t.(anonymous function).(anonymous function).o._onDataAvailable (http://localhost:63220/PqGridPro/pqgrid.min.js:12:25801)
    at t.(anonymous function).(anonymous function).a.refreshDataAndView (http://localhost:63220/PqGridPro/pqgrid.min.js:10:22059)
    at t.(anonymous function).(anonymous function).r._create (http://localhost:63220/PqGridPro/pqgrid.min.js:12:18558)
shiftRC @ pqgrid.min.js:16
onDataReadyDone @ pqgrid.min.js:17
(anonymous) @ pqgrid.min.js:16
o @ pqgrid.min.js:9
i._trigger @ pqgrid.min.js:9
a.refreshDataFromDataModel @ pqgrid.min.js:10
a.refreshView @ pqgrid.min.js:10
o._onDataAvailable @ pqgrid.min.js:12
a.refreshDataAndView @ pqgrid.min.js:10
r._create @ pqgrid.min.js:12
(anonymous) @ jquery-ui.min.js:7
_createWidget @ jquery-ui.min.js:7
t.(anonymous function).(anonymous function) @ jquery-ui.min.js:7
(anonymous) @ jquery-ui.min.js:7
each @ jquery.min.js:2
each @ jquery.min.js:2
t.fn.(anonymous function) @ jquery-ui.min.js:7
i.grid @ pqgrid.min.js:12
SalesGrid @ home:600
(anonymous) @ home:902


pqgrid.min.js:16 Uncaught TypeError: Cannot read property 'length' of undefined
    at Function.shiftRC (pqgrid.min.js:16)
    at _pq.cFormulas.onDataReadyDone (pqgrid.min.js:17)
    at t.(anonymous function).(anonymous function).<anonymous> (http://localhost:63220/PqGridPro/pqgrid.min.js:16:30897)
    at o (pqgrid.min.js:9)
    at t.(anonymous function).(anonymous function).i._trigger (http://localhost:63220/PqGridPro/pqgrid.min.js:9:7633)
    at t.(anonymous function).(anonymous function).a.refreshDataFromDataModel (http://localhost:63220/PqGridPro/pqgrid.min.js:10:17779)
    at t.(anonymous function).(anonymous function).a.refreshView (http://localhost:63220/PqGridPro/pqgrid.min.js:10:21420)
    at t.(anonymous function).(anonymous function).o._onDataAvailable (http://localhost:63220/PqGridPro/pqgrid.min.js:12:25801)
    at t.(anonymous function).(anonymous function).a.refreshDataAndView (http://localhost:63220/PqGridPro/pqgrid.min.js:10:22059)
    at t.(anonymous function).(anonymous function).r._create (http://localhost:63220/PqGridPro/pqgrid.min.js:12:18558)

[paramvir]

Please share a small test case on jsfiddle with reproducible error so that I can check it for you.