[SalesForce] Process Builder Deployment Error: “We can’t find an action with the name and action type that you specified.”

after making updates to a process builder for task record inserts, I am trying to deploy it – using change sets – to the Testing sandbox from our Development sandbox. The previous deployment – which contained 9 Email Alert immediate actions – worked fine in Testing sandbox and is presently activated and has been running for about a month now.

However, after adding a couple more conditions (that use Text Field Immediate Actions) on the Development Sandbox's process builder today, I am getting this error during deployment to Testing sandbox: myRule_1_A1 (Action) -We can't find an action with the name and action type that you specified. I have no idea why the process builder is not deploying. Here are some screen scrapes of the updates I made to the process builder.
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Best Answer

I'll add another possible reason for this (as it happened to me today):

Deploying a Flow with actions that included sending emails. These require an Workflow Email Alert to be deployed but if the Workflow is not part of the deployment package, the deployment fails with a message that starts with:

We can't find an action with the name and action type that you specified