The most likely cause of this problem is that your Main entry point does not have the [STAThread] attribute associated with it. Without this attribute, the Essential Grid support of the OLE Drag and Drop causes this error.
There are two possible solutions. The first one is to add the [STAThread] attribute and remove the [MTAThread] attribute in case it is present. The second one is to remove the OLE Drag and Drop support from the Essential Grid.
Solution 1: Here is a sample Main entry point with the STAThread attribute.
Solution 2: To remove OLE Drag and Drop support so that you application can be MTAThread.
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