Cannot Open ButtonBars

[careed]

When I try to open/edit the ButtonBars property of my GridGroupingControl in Visual Studio the following error message is displayed: Object reference not set to an instance of an object. What could be causing this error? Am I missing a project reference? Is Essential Studio installed incorrectly?

[Administrator]

Hi careed,

It looks like you have multiple versions of Essential studio installed on your system and
some of the references are still pointing to the old version. Else the bin folder might contain the different versions of the dll''s than in the GAC.

Best Regards,
A.Sivakumar