Send email (Exchange) Error: can not load assembly

[Roman (Roman Rylov)]

Duplicate of the same issue, please see this post:

Can't Use Email (Exchange)

When I try and use one of the workflow actions to send an email(enterprise, originally with attachments, however I have tried without) it fails with the following exception: Could not load file or assembly ‘Microsoft.Exchange.WebServices, Version=15.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35’ or one of its dependencies. The system cannot find the file specified. The normal email action (email these users) still works however. System: SP2013 Standard On Premise Workflow Action P…