I am evaluating the Nevron Chart for Sharepoint 2009 Vol 2 version and I am impressed and excited at what I have been able to achieve through the web part. After running the 'Run Chart Designer' and connecting to my datasource, I can create the charts I need and preview them. However the problem I have is when I am finished and want to 'publish/display' the chart on my Sharepoint site (by clicking the apply or ok button) the Nevron Webpart display a box with an error message in it that says;

" The following error occurred while updating the chart: ConnectionString cannot be an empty string."

Can someone help me with this?

Hi Peter,

You may have forgotten about the issue that you have experienced, but we had to check it anyway, so we downloaded as much evals of sharepoint web parts as we could and tested the chart with them. It turned out that there is indeed a bug in the current implementation of the chart designer, when it tries to save the state to the webpart on the page. The problem was an unsafe cast, which is fixed in the SharePoint Vision version that we are about to release this week (along with several other issues that clients experienced). You may be interested to know that it has many improvements the major one of which is the new Gauge for SharePoint.

Best Regards,
Nevron Support Team