Unknown collection member
===

In a SSRS report my chart is linked to a dataset. However in the expression it says "Report item not linked to a dataset."

I like to hide the chart when no data is available. But because I cannot see the dataset it won't work. Even when I mention the dataset in the expression:

=IIf(Count(Fields!hostname.Value, "DataSetName")=0,True,False)

It gives me this error when I hover over "hostname.Value" => "Unknown collection member."

I've already remove the .data file because it was suggested here, but that doesn't work.

Anyone an idea?

