Hey @SazzadH , I have had this same problem to my PDI, but I assure you this is nothing to worry about this is the problem from ServiceNow end itself, I tried resetting the instance, getting a new one by releasing previous, this problem occurred, Just wait for few days and Reset the PDI the warning will be gone.
If this helps you Please Mark this solution as accepted and helpful as it will be helpful for other users and readers as well.
Best Regards.
Saurabh V.
