TypeError: this.cont is null

Suite and Optimus Suite 5
#1

I am trying to use paging methods of DHTLMX tree grid for my salesforce records.
but getting this error.
TypeError: this.cont is null on
dhtmlxtoolbar.js (line 7, col 107)

is there any problem with library.
my code is

[code]

 

Loading...

    </td>          
</tr>
<tr> <td><a href="#" OnClick="SelectedVal();"> Selected Value</a></td></tr>
[/code]
#2

In your code:

    mygrid.enablePaging(true,15,5,"pagingbox",true);

Please, make sure that you have this “pagingbox” container on your page.