Microsoft Dynamics CRM 2013 Plugin - There is no active transaction error

Question

I have been struggling with a an error in a plugin for MS Dynamics CRM Online. (see below). It appears to happen at random times, but more likely to occur when the activity is h

Answer 1

I was receiving this same error in CRM online 2015.1. After much pulling of hair and gnashing of teeth, I was finally able to figure out every single plugin step for the Activity Feeds Plugin had been duplicated. I removed all duplicates and the issue resolved itself.