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Power Monitoring Expert - When user click on a Data Log Viewer in Diagrams, an error - 'There was a problem processing your request. Try Again'

Issue
When user is in the Diagrams web application, and click on a Data Log viewer in order to view historical data, an error 'There was a problem processing your request' appears in the browser

Product Line
SPM7.x
Power Monitoring Expert 7.x
Power Monitoring Expert 8.x


Environment
Web Applications

Cause
This will happen if the  HKEY_CURRENT_USER\SOFTWARE\Microsoft\Internet Explorer\International registry key has a 'AcceptLanguage' value associated with it, and the data for that value is NULL.
If the 'AcceptLanguage' value does not exist at all, Diagrams will use the OS language, however if that value does exist, and it is empty, then Diagrams crashes. 

Resolution
*Warning: This article contains information about editing the registry. Improper changes to the registry can permanently damage the operating system. Always backup the registry before making any changes.* 

1) Navigate to HKEY_CURRENT_USER\SOFTWARE\Microsoft\Internet Explorer\International registry key to check if key exist and the value of data.

2) Insert correct data  - e.g. en-US, en; q=0.5 
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