Service Binding Error "This Worker no longer exists"

My service binding, in settings, is showing this error message: This Worker no longer exists and can not be used. Please try using a different Worker.
But the worker does exist and if I make a browser request to the worker it returns the expected response, and everything looks fine in its logs.
I'm trying to bind to the worker from pages. When I make a request through the calling website the
pages
log shows this:
js"worker error:",
        "TypeError: The RPC receiver does not implement the method \"emailFunc\"."

But again the worker does implement the method.
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