I receive this error message from Settings>Extensions in Google Chrome Version 48.0.2540.0 dev-m (64-bit):
Avast Online Security 10.2.0.190
Avast Browser Security and Web Reputation Plugin.
Details Options
Warning:
This extension failed to redirect a network request to chrome-extension://gomekmidlodglbbmalcneegieacbdmki/common/mocks/gpt.js because another extension (HTTPS Everywhere) redirected it to https://www.googletagservices.com/tag/js/gpt.js.