While trying to run a Deployment imaging task, the following error happens when the task is started:
An unknown exception was thrown on server side.
System.Exception: Error response returned from server: The handler 'GetTaskVersion' is failed to process request. Failed to get task data for task version 78fe8847-8189-4a43-a251-5026b807c6e4Request: source=10.71.38.92, version=8.7.2338.0, size=0, page=GetTaskVersion.aspx
The Site Server being used didn't have "Deployment Task Server Handler" agent listed as installed(or needed to be upgraded).
Make sure the "Deployment Task Server Handler" agent is installed/upgraded on any Site Server that is going to be used to assist with Deploying images tasks.
Also, as part of the requirements, "Altiris Client Task Server Agent" and "Deployment Solution Plu-in" need to be installed and up-to-date for the "Deployment Task Server Handler" agent to be able to install/upgrade.
If you have issues trying to install or upgrade the "Deployment Task Server Handler" agent, review the following KB articles:
207317 "Unable to install Deployment Task Server Handler on Site Server"
191333 "error: COM object 'DeploymentSolutionAgent_Task' is not found, make sure the corresponding plug-in or task handler module is installed and registered"