Sometimes when i try to transfer the project to target and I get the message on the screenshot. After restarting Automation Studio, the transfer works !
I have been using Automation Studio for almost 2 years, and i never have this problem before.
Nota : Before I was using AS 4.10, and I switched to AS 4.12 not long ago.
If i remember correctly the easiest workaround was to disconnect and reconnect via the online Settings. Then the next Transfer will work again.
This was a sporadic error we had some tines in our trainings but were never able to reproduce. Since a while it did not occured. Maybe Fixed via a Servicepack.
This is a known issue which was resolved in Automation Runtime E4.93. Please upgrade your AR version to at least E4.93 to resolve the issue (you are using AR B4.93 in the screenshot).
Michael is correct that disconnecting and reconnecting is a workaround when using the affected versions.