Cannot run REPL via cider-jack-in after package upgrade

[stanislavgrujic]

I downloaded the configuration zip file and did as instructed in the installation manual.
As I started Emacs, I ran the M-x package-list-packages and upgraded packages to the newer versions.
After the Emacs is restarted, REPL cannot be started anymore.
During Emacs startup there is a message saying Symbol's function definition is void: global-rainbow-delimiters-mode.
PR #17 seems to make this message go away, but the REPL still cannot be started.

The message which is reported, when I try to run M-x cider-jack-in is Symbol's function definition is void: nil.

The same issue occurs if I clone the repo and upgrade packages in Emacs.

[flyingmachine]

I think this has been resolved