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Charting Control Error - Invalid temp directory in chart handler configuration 

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You may receive the following error when using the Microsoft Charting Controls for ASP.NET:

Invalid temp directory in chart handler configuration

To resolve this issue, set a temporary directory within your site like the following:

<appSettings>
<add key="ChartImageHandler" value="storage=file;timeout=20;Url=~/chartTmpImages/;"/>
</appSettings>


Ensure that the directory has been created first from FTP.