Sometimes ago I delegated ~67 SP to @minnowbooster.
Back then I just wanted to try their service. There weren't any problems to do it. However right now I'm trying to cancel my delegating to them, but I simply can't.
On the next webpage I press CONTINUE button
Then I fill in my username on steemit.com which is @everythink, and fill in my active key. Next I press SIGN IN button.
And after that I get following error message:
How should I solve it??
Note: My active key I take from here: