java.io.IOException: Channel is not set

[MikeAllgood]

First, I have looked at the other threads relative to the "Channel is not set" errors, and they are more specific to the OP's situation from what I saw. I understand this is some sort of connectivity issue and wanted to provide our system's log message details in hopes someone can provide any direction to point me in.

The wrapper log message is:

java.io.IOException: Channel is not set.
at com.inductiveautomation.perspective.gateway.model.PageModel.send(PageModel.java:363)
at com.inductiveautomation.perspective.gateway.model.PropertySyncManager$SendUpdates.run(PropertySyncManager.java:224)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.base/java.util.concurrent.FutureTask.run(Unknown Source)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at com.inductiveautomation.perspective.gateway.threading.BlockingWork$BlockingWorkRunnable.run(BlockingWork.java:58)
at java.base/java.lang.Thread.run(Unknown Source)

Hovering over the magnifying glass in the log entry, I get this:

We don't have a view named "Header" in this project.
I'm at a loss as to what is causing this Sync error in the logs.

Any insight as to what that log message is trying to communicate?

Thanks!

[MikeAllgood]

Follow up:

So these messages are hitting the wrapper log every second. Looking at details of more of these, I noticed something I consider odd. In the following images, the project-name and the session-project are different (same as the previous image above):

The views noted do exist in the project id'd in the project-name but not in the session-project.

How would there be different projects in these two fields?

There are other log messages that have Digital_Milling in bot fields, so I'm expecting this to be associated with that project. Here are a couple of examples (NOTE: the actual log messages are exactly the same for all the log entries I've compared.):

Unfortunately, I am not sure how to even start debugging this.