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Why are there 'An unknown exception occurred in XL20' errors showing up in my system logs?'

Issue
The XL20 communication dll is throwing an exception

Product Line
PME7, PME7.2, PME8.0

Environment
Device Communications

Resolution
There is a hot fix for this issue, attached to this article.
*Warning: Take backups of any files prior to modifying them. Ensure the backups are in a location that will not be overwritten (i.e. the Desktop).
1) Navigate to the /Power Monitoring Expert/system/bin folder
2) Rename or backup the file xl20.dll
3) Place the .dll from this article in the folder, overwiting the file if needed
4) Restart ION Network Router Service
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