component "usocket" not found
   [Condition of type ASDF:MISSING-COMPONENT]

Restarts:
 0: [RETRY] Retry SLIME REPL evaluation request.
 1: [ABORT] Return to sldb level 1.
 2: [RETRY] Retry SLIME REPL evaluation request.
 3: [ABORT] Return to SLIME's top level.
 4: [TERMINATE-THREAD] Terminate this thread (#<THREAD "repl-thread" RUNNING {BDA10F9}>)

Backtrace:
  0: (ASDF:FIND-SYSTEM :USOCKET T)
  1: (SB-INT:SIMPLE-EVAL-IN-LEXENV (ASDF:FIND-SYSTEM :USOCKET) #<NULL-LEXENV>)
  2: (SWANK::EVAL-REGION "(asdf:find-system :usocket)\n")
  3: ((LAMBDA ()))
  4: (SWANK::TRACK-PACKAGE #<CLOSURE (LAMBDA #) {B17019D}>)
  5: (SWANK::CALL-WITH-RETRY-RESTART "Retry SLIME REPL evaluation request." #<CLOSURE (LAMBDA #) {B17012D}>)
  6: (SWANK::CALL-WITH-BUFFER-SYNTAX NIL #<CLOSURE (LAMBDA #) {B170115}>)
  7: (SWANK::REPL-EVAL "(asdf:find-system :usocket)\n")
  8: (SB-INT:SIMPLE-EVAL-IN-LEXENV (SWANK:LISTENER-EVAL "(asdf:find-system :usocket)\n") #<NULL-LEXENV>)
  9: (SWANK::EVAL-FOR-EMACS (SWANK:LISTENER-EVAL "(asdf:find-system :usocket)\n") "COMMON-LISP-USER" 18)
 10: (SWANK::SLDB-LOOP 1)
 11: ((FLET SWANK-BACKEND:CALL-WITH-DEBUGGING-ENVIRONMENT) #<FUNCTION (LAMBDA #) {B914C35}>)
 12: (SWANK::DEBUG-IN-EMACS #<SB-KERNEL::ARG-COUNT-ERROR {B601F81}>)
 13: (SWANK:INVOKE-SLIME-DEBUGGER #<SB-KERNEL::ARG-COUNT-ERROR {B601F81}>)
 14: (SWANK-BACKEND::CALL-WITH-BREAK-HOOK #<FUNCTION SWANK:SWANK-DEBUGGER-HOOK> #<CLOSURE (LAMBDA #) {B606075}>)
 15: ((FLET SWANK-BACKEND:CALL-WITH-DEBUGGER-HOOK) #<FUNCTION SWANK:SWANK-DEBUGGER-HOOK> #<CLOSURE (LAMBDA #) {B606075}>)
 16: (SWANK:SWANK-DEBUGGER-HOOK #<SB-KERNEL::ARG-COUNT-ERROR {B601F81}> #<unavailable argument>)
 17: (SB-DEBUG::RUN-HOOK *DEBUGGER-HOOK* #<SB-KERNEL::ARG-COUNT-ERROR {B601F81}>)
 18: (INVOKE-DEBUGGER #<SB-KERNEL::ARG-COUNT-ERROR {B601F81}>)
 19: (ERROR SB-KERNEL::ARG-COUNT-ERROR)[:EXTERNAL]
 20: (SB-KERNEL::ARG-COUNT-ERROR DESTRUCTURING-BIND NIL NIL (ASDF-INSTALL::SOURCE ASDF-INSTALL::SYSTEM ASDF-INSTALL::NAME) 3 3)
 21: (ASDF-INSTALL:INSTALL)[:EXTERNAL]
 22: (SB-INT:SIMPLE-EVAL-IN-LEXENV (ASDF-INSTALL:INSTALL :USOCKET) #<NULL-LEXENV>)
 23: (SWANK::EVAL-REGION "(asdf-install:install :usocket)\n")
 24: ((LAMBDA ()))
 25: (SWANK::TRACK-PACKAGE #<CLOSURE (LAMBDA #) {B5A49ED}>)
 26: (SWANK::CALL-WITH-RETRY-RESTART "Retry SLIME REPL evaluation request." #<CLOSURE (LAMBDA #) {B5A497D}>)
 27: (SWANK::CALL-WITH-BUFFER-SYNTAX NIL #<CLOSURE (LAMBDA #) {B5A4965}>)
 28: (SWANK::REPL-EVAL "(asdf-install:install :usocket)\n")
 29: (SB-INT:SIMPLE-EVAL-IN-LEXENV (SWANK:LISTENER-EVAL "(asdf-install:install :usocket)\n") #<NULL-LEXENV>)
 30: (SWANK::EVAL-FOR-EMACS (SWANK:LISTENER-EVAL "(asdf-install:install :usocket)\n") "COMMON-LISP-USER" 6)
 31: (SWANK::PROCESS-REQUESTS NIL)
 32: ((LAMBDA ()))
 33: (SWANK-BACKEND::CALL-WITH-BREAK-HOOK #<FUNCTION SWANK:SWANK-DEBUGGER-HOOK> #<CLOSURE (LAMBDA #) {BDA30B5}>)
 34: ((FLET SWANK-BACKEND:CALL-WITH-DEBUGGER-HOOK) #<FUNCTION SWANK:SWANK-DEBUGGER-HOOK> #<CLOSURE (LAMBDA #) {BDA30B5}>)
 35: (SWANK::CALL-WITH-BINDINGS ((*STANDARD-OUTPUT* . #) (*STANDARD-INPUT* . #) (*TRACE-OUTPUT* . #) (*ERROR-OUTPUT* . #) (*DEBUG-IO* . #) (*QUERY-IO* . #) ...) #<CLOSURE (LAMBDA #) {BDA30CD}>)
 36: (SWANK::CALL-WITH-CONNECTION #<SWANK::CONNECTION {AB11309}> #<CLOSURE (LAMBDA #) {BDA30B5}>)
 37: (SWANK::HANDLE-REQUESTS #<SWANK::CONNECTION {AB11309}> NIL)
 38: (SWANK::CALL-WITH-BINDINGS NIL #<CLOSURE (LAMBDA #) {BDA308D}>)
 39: ((FLET #:WITHOUT-INTERRUPTS-BODY-[BLOCK351]356))
 40: ((FLET SB-THREAD::WITH-MUTEX-THUNK))
 41: ((FLET #:WITHOUT-INTERRUPTS-BODY-[CALL-WITH-MUTEX]293))
 42: (SB-THREAD::CALL-WITH-MUTEX ..)
 43: ((LAMBDA ()))
 44: ("foreign function: #x8066ECB")
 45: ("foreign function: #x8052ECD")
 46: ("foreign function: #x805E050")
 47: ("foreign function: #xB7FB84FF")