Issues when deploying to test server

[Michael]

We have a number of controls that work perfectly on my dev machine when testing. When i deploy to our test server I get errors on two seperate pages. The first error happens when trying to insert into a grid:

Exception information: 
    Exception type: NullReferenceException 
    Exception message: Object reference not set to an instance of an object.
   at Account1_UserRegistration.radgrdUserList_ItemCommand(Object sender, GridCommandEventArgs e) in e:\Build\24-7\24-7 Web Application\Randox247Website\Account1\UserRegistration.aspx.cs:line 458
   at Telerik.Web.UI.RadGrid.OnBubbleEvent(Object source, EventArgs e)
   at System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args)
   at Telerik.Web.UI.GridItem.OnBubbleEvent(Object source, EventArgs e)
   at System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

The second happens on a page with numerous rad controls:

  Exception type: ArgumentOutOfRangeException 
    Exception message: Selection out of range
Parameter name: value
   at Telerik.Web.UI.RadComboBox.PerformDataBinding(IEnumerable dataSource)
   at Telerik.Web.UI.RadComboBox.PerformSelect()
   at Configuration_EDI.rebindClearCombo() in e:\Build\24-7\24-7 Web Application\Randox247Website\EDI\Configuration.aspx.cs:line 792
   at Configuration_EDI.btnNewRecord_Click(Object sender, EventArgs e) in e:\Build\24-7\24-7 Web Application\Randox247Website\EDI\Configuration.aspx.cs:line 139
   at Telerik.Web.UI.RadButton.RaisePostBackEvent(String eventArgument)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

Both builds on my machine and on test are pointing towards the same database so it cannot be a data issue. Any help on this would be greatly appreciated.