Genesis cannot start: "Value cannot be null."

Hi

What to do when I get this error messages in Genesis:

 

Unable to open dashboard 'OpenPlace_(Designer)'.

Error processing DataSet 'GetWFSteps'. Error executing Workspace Assembly Service class 'Workspace.Gen.CubeViewCharts_x2x.MUAssemblyFactory'.Value cannot be null. (Parameter 'reader').

How to reset?

The problem happens when working with Block: Cube View Charts. It will not read my cube view and give the following comment: Value cannot be null. An error messages that is difficult to work with, as it does not say where the problem is. But this second, as I cannot get into the genesis instance.