Account setup[ Edited ]
December 2016 - last edited December 2016
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I cleared history, restarted PC, logged out and everything but nothing it appears again.
I've run into this problem several times. Try disabling any browser extensions (such as ad blockers) if you're using them. You can also try logging in to your AdWords account with a different web browser.
If you continue getting the error, wait a few hours before trying again. Frustrating, I know.
If there's a change you need to post in the meanwhile, I'd recommend using the AdWords Editor.