That is the message you will get if you open Sunrise, then open it again while the first is still running, then repeat this nine more times. The first ten will run, then, when you attempt the eleventh, you get the message.
The obvious answer is, "Don't do that!"
But I assume you have a reason for having so many instances open. What are you trying to do with 11+ instances? Maybe there is a better way.
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