Running GNUEmacs 26.3 on Windows 10, trying to set up environment per instructions for 'Clojure for the Brave and True' from here:


I was able to get the packages built and such, looks like it behaves ok. However, when I start a lein repl in the directory and call M-x cider-jack-in, I get:

Spawning child process: Invalid argument

Not sure where to go from here.

1 Answer 1


Try M-x cider-connect if you've already started a REPL via leiningen yourself.

cider-jack-in tries to start a repl-server and connect to it. For some reason, this fails, maybe because of the already running REPL, so you might try cider-jack-in without starting a REPL manually first.

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