Outlook Addin invisible or inactive with error in debug log Dump of exception type 'System.IO.FileLoadException'

Sometimes the Outlook Addin, especially after a reinstall, becomes inactive or the Outlook Addin does not show up at all. The reason behind this is that the two below mentioned files have different build releases which causes the assemblies not to be loaded. After enabling the debug log file, the following error log can be seen: Error: 23.04.2009 11:51:47 [1] Dump of exception type 'System.IO.FileLoadException... Read the full text.
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