Open in another instance

Whenever I try to open some of my apps it always shows "It seems that the app located at '_(app directory)_'  is already open in another instance of Mendix Studio Pro . Not version specific error, Why so ? 
1 answers

Hi Aman,

Its not an error, its a warning message that you didn't stop the server and close it. If you got the message, there is an option "open anyway" you can click on it and continue with the studio pro. When you are closing the studio pro please stop the server.

Hope it helps!!!!