Stacktrace error "source was not found!" occurs when opening Workflow Monitor in AWI

Document ID : KB000120632
Last Modified Date : 08/11/2018
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When working in the Automic Web Interface (AWI), connections fail when opening the workflow monitor. The following stack trace is seen in the AWI logs:

Connection could not be created: 55300682/45_to_55300682/74; source was not found!
java.lang.Exception$2.onException( com.uc4.ecc.widgets.canvas.gwe.eventhandling.EventHandler.onException( sun.reflect.GeneratedMethodAccessor447.invoke(Unknown Source) 
This is a bug in the Automic Web Interface.
This issue is fixed in the following versions:

Automic Web Interface 12.1.3 HF1 - available for download
Automic Web Interface 12.1.4 - planned release date for January 28, 2019
Automic Web Interface 12.2.1 - available for download
Automic Web Interface 12.3.0 - planned release date for February 28, 2019