This is a known error triggered due to the update on improving ArcGIS Online security using the Transport Layer Security (TLS) 1.2 connections, affecting products that are connected to ArcGIS Online.
To resolve this you have to install and enable TLS 1.2 on ArcGIS Desktop:
From your tag, I can understand that you are on 10.5.
Install the TLS patch for your ...
The simple fix is:
go to this directory
to any other name, for example,
Your identify popup window will popup normally.
mal-function template file cause the problem. When you rename it. a new freshed template file generated. fixed the ...