Greetings: I'm also having this problem when I evaluate the first FOMUS example in the dictionary : The function FOMUS:REST is undefined. [Condition of type UNDEFINED-FUNCTION] Restarts: 0: [ABORT-REQUEST] Abort handling SLIME request. 1: [TERMINATE-THREAD] Terminate this thread (#<THREAD "new-repl-thread" {E6A8B99}>) Backtrace: 0: ("bogus stack frame") FOMUS v0.1.57, SBCL, CM 2.8.0 Best, dp