jQuery Grid Plugin - jqGrid

Hello,

I am trying to implement tree grid using the latest version JQGrid 4.2. When i click the tree node to get the child nodes  I get the error "Uncaught TypeError: Cannot read property 'rowIndex' of undefined". Error comes in expandNode method in JQGrid.min.js.

When  I checked the same using dev version of Jqgrid js the error comes in the line below.

var rc1 = $("#"+id,this.grid.bDiv)[0];

Please help me out. I previously implemented the grid using version 3.5.3 and I want it to update to the latest.

Thanks,

Raj.