User receives "System.MissingMethodException" exception when launching an Office application

User receives "System.MissingMethodException" exception when launching an Office application

Applies to

All versions of Cryptshare for Office 365 & Outlook

Symptom

When the user launches an Office application (Outlook, Word, Excel), an exception is displayed. The exception contains the following two messages:

Exception Type: System.MissingMethodException

Exception Message: Method not found: Void NLog.Logger.Error(System.Exception, System.String).

Cause

The client is missing .NET Framework v4.5, a prerequisite for the Add-in.

Solution

Install .NET Framework v4.5 on the affected client