I think this is one of those errors that goes away upon zapping fasls, but I also think I've seen it before. Any clues? thanks, cyrus Class not yet defined: CLIM:INTERACTOR-PANE [Condition of type SIMPLE-TYPE-ERROR] Restarts: 0: [TRY-RECOMPILING] Recompile commands and try loading it again 1: [RETRY] Retry performing #<ASDF:LOAD-OP NIL {131F6EF1}> on #<ASDF:CL-SOURCE-FILE "commands" {12811131}>. 2: [ACCEPT] Continue, treating #<ASDF:LOAD-OP NIL {131F6EF1}> on #<ASDF:CL-SOURCE-FILE "commands" {12811131}> as having been successful. 3: [RETRY] Retry SLIME REPL evaluation request. 4: [ABORT] Return to SLIME's top level. 5: [TERMINATE-THREAD] Terminate this thread (#<THREAD "repl-thread" RUNNING {11A9D949}>) Backtrace: 0: (SB-KERNEL:FIND-CLASSOID-CELL CLIM:INTERACTOR-PANE)[:EXTERNAL] 1: (SB-FASL::FOP-FUNCALL) 2: (SB-FASL::LOAD-FASL-GROUP #<SB-SYS:FD-STREAM for "file /Users/ sly/src/lisp/mcclim/mcclim/sbcl-1.0.29.13-darwin-x86/ commands.fasl" {119F2639}>) 3: ((FLET SB-THREAD::WITH-RECURSIVE-LOCK-THUNK)) 4: ((FLET #:WITHOUT-INTERRUPTS-BODY-[CALL-WITH-RECURSIVE-LOCK]291)) 5: (SB-THREAD::CALL-WITH-RECURSIVE-LOCK ..) 6: (SB-FASL::LOAD-AS-FASL #<SB-SYS:FD-STREAM for "file /Users/sly/ src/lisp/mcclim/mcclim/sbcl-1.0.29.13-darwin-x86/ commands.fasl" {119F2639}> NIL #<unavailable argument>) 7: ((FLET SB-FASL::LOAD-STREAM) #<SB-SYS:FD-STREAM for "file /Users/ sly/src/lisp/mcclim/mcclim/sbcl-1.0.29.13-darwin-x86/ commands.fasl" {119F2639}>) 8: (LOAD #P"/Users/sly/src/lisp/mcclim/mcclim/sbcl-1.0.29.13-darwin- x86/commands.fasl")[:EXTERNAL] 9: ((SB-PCL::FAST-METHOD ASDF:PERFORM (ASDF:LOAD-OP ASDF:CL-SOURCE- FILE)) #<unavailable argument> #<unavailable argument> #<ASDF:LOAD-OP NIL {131F6EF1}> #<ASDF:CL-SOURCE-FILE "commands" {12811131}>) 10: ((LAMBDA (SB-PCL::.PV. SB-PCL::.NEXT-METHOD-CALL. SB-PCL::.ARG0. SB-PCL::.ARG1.)) ..) 11: ((SB-PCL::FAST-METHOD ASDF:PERFORM ASDF:AROUND (ASDF:LOAD-OP ASDF:CL-SOURCE-FILE)) ..) 12: ((LAMBDA ())) 13: ((FLET SB-THREAD::WITH-RECURSIVE-LOCK-THUNK))