purple line under the finder icon

Can someone tell me what the purple line is under my finder icon? I did some research and looked and can not find an answer.

MacBook Pro 13 "early 2011

16 GB memory

OS version 10.11.16

Thanks much for any help you can give me!

Christelle

I suspect it is a problem of Dock. Try to restart the dock through the terminal.app

copy and paste:

Killall Dock

Tags: Mac OS & System Software

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    Try opening terminal and copy and paste

    Killall Dock

    You can also check your launching pad to see if there is an incomplete download associated with the app

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