'Disk Not Ejected Properly' Message on Mac

Hello, 

I am using a nrf Development kit and I have it plugged in into a mac laptop. It works fine, but I keep getting the message that says:

Disk Not Ejected Properly

Eject "JLINK" before disconnecting or turning it off.

Please see attached image. It pops up many times and is very annoying. Why does this occur? How can I fix this? 

Thanks,

Reuben

 

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