Why do I get an error dialog with "You must rename an identifier" from Visual Studio?

I am continuously getting this error message: "You must rename an identifier" from Visual Studio 2017 Community Edition.

The error dialog is:

Title: Microsoft Visual Studio,
Icon: Red circle with a white X (Error),
Body: "You must rename an identifier."
Available Buttons: OK

Error Message

I have already ran a repair of my Visual Studio installation, but the problem is still the same.

Solution

I went to menu==> Tools==> Options==> Environment==> Keyboard, then pressed the Reset button. After this the message isn't coming. i think there had some common key mapped as a shortcut as Matt Johnson said. Resetting buttons clears common key mappings.