'Spacemacs Deletes Packages After Installation. How do i midigate this

I am using spacemacs and I am attempting to install packages with M-x "package install $package-name". The particular package I am trying to install is SLY, A newer implementation of The SLIME REPL for Common Lisp. When I Install the package when I start up spacemacs it works fine. However when exiting spacemacs it somehow gets deleted. After googling this issue I found this page https://develop.spacemacs.org/doc/FAQ.html. I followed the instructions and changed my .spacemacs config. I added the line dotspacemacs-install-packages 'used-but-keep-unused. What am I doing wrong.



Solution 1:[1]

You should add your personal packages to dotspacemacs-additional-packages

Sources

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Source: Stack Overflow

Solution Source
Solution 1 Tianshu Wang