There are two solutions to this problem:
1. Follow the instructions in DesktopModules\Reports\ExtVisualizers\Install.txt to install the ZedGraph package.
2. Ignore the error, as long as the Chart visualizer remains in the ExtVisualizers folder it is not used by the Reports module.

This error is caused by the fact that the Chart visualizer, like the Reporting Services visualizer, requires an external component and to avoid licensing issues you must download it yourself. This is why those visualizers are not installed by default, as long as they remain in the ExtVisualizers folder, they will not affect your running portal. The ZedGraph component is 100% free and is licensed under the LGPL so #1 may be your best option.

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Andrew Nurse
DotNetNuke Core Team Member and Reports Module Project Lead
Microsoft Certified Professional Developer

I believe, if you place the entire "ab" folder (replacing "ab" with your native language code, I believe that's "sv" in your case), in the 'bin' folder of your website it will allow ZedGraph to localize itself. So that resource DLL would be at this path: "bin/sv/ZedGraph.resources.dll"

However, I don't believe the module uses any of the features in ZedGraph that require localization, so you can probably just ignore this folder. You should only need the ZedGraph.dll and ZedGraph.Web.dll libraries to use the Chart Visualizer. My recommendation is to just ignore the localized resource DLLs unless you find you need it.

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Andrew Nurse
DotNetNuke Core Team Member and Reports Module Project Lead
Microsoft Certified Professional Developer