Initial fetch row not working correctly

[Anonymous]

I am try to creating the extension in which I went to fetch 1000 rows at a time.

I am using below code :

initialProperties: {

     qHyperCubeDef: {

         qDimensions: [],

          qMeasures: [],

          qInitialDataFetch: [{

          qWidth: 50,

          qHeight: 1000

     }]

     }

     }

Issue : It throwing error