The value
  :TRIAL-ASSETS
is not of type
  (OR (VECTOR CHARACTER) (VECTOR NIL) BASE-STRING PATHNAME
      SYNONYM-STREAM FILE-STREAM)

when binding PATHNAME
   [Condition of type TYPE-ERROR]

Restarts:
 0: [TRY-RECOMPILING] Recompile workbench and try loading it again
 1: [RETRY] Retry loading FASL for #<CL-SOURCE-FILE "trial-vr" "src" "workbench">.
 2: [ACCEPT] Continue, treating loading FASL for #<CL-SOURCE-FILE "trial-vr" "src" "workbench"> as having been successful.
 3: [RETRY] Retry ASDF operation.
 4: [CLEAR-CONFIGURATION-AND-RETRY] Retry ASDF operation after resetting the configuration.
 5: [RETRY] Retry ASDF operation.
 --more--

Backtrace:
  0: (MERGE-PATHNAMES :TRIAL-ASSETS #P"C:/msys64/home/selwyn/" 2452679730031465944) [external]
      Locals:
        NIL = :TRIAL-ASSETS
        NIL = #P"C:/msys64/home/selwyn/"
        NIL = 2452679730031465944
        NIL = 2
  1: ((:METHOD TRIAL:POOL-PATH (TRIAL:POOL T)) #<TRIAL:POOL WORKBENCH :TRIAL-ASSETS> #P"heart-in-the-sand/posx.jpg") [fast-method]
      Locals:
        PATHNAME = #P"heart-in-the-sand/posx.jpg"
        TRIAL:POOL = #<TRIAL:POOL WORKBENCH :TRIAL-ASSETS>
  2: ((:METHOD TRIAL:COERCE-ASSET-INPUT (TRIAL:ASSET LIST)) #<TRIAL:IMAGE WORKBENCH/SKYBOX> (#P"heart-in-the-sand/posx.jpg" #P"heart-in-the-sand/negx.jpg" #P"heart-in-the-sand/posy.jpg" #P"heart-in-the-san..
      Locals:
        TRIAL:ASSET = #<TRIAL:IMAGE WORKBENCH/SKYBOX>
        LIST = (#P"heart-in-the-sand/posx.jpg" #P"heart-in-the-sand/negx.jpg" #P"heart-in-the-sand/posy.jpg" #P"heart-in-the-sand/negy.jpg" #P"heart-in-the-sand/posz.jpg" #P"heart-in-the-sand/negz.jpg")
  3: ((:METHOD SHARED-INITIALIZE :AFTER (TRIAL:FILE-INPUT-ASSET T)) #<TRIAL:IMAGE WORKBENCH/SKYBOX> #<unused argument>) [fast-method]
      Locals:
        TRIAL:ASSET = #<TRIAL:IMAGE WORKBENCH/SKYBOX>
  4: ((SB-PCL::EMF SHARED-INITIALIZE) #<unused argument> #<unused argument> #<TRIAL:IMAGE WORKBENCH/SKYBOX> T :INPUT (#P"heart-in-the-sand/posx.jpg" #P"heart-in-the-sand/negx.jpg" #P"heart-in-the-sand/posy..
      Locals:
        SB-PCL::.ARG0. = #<TRIAL:IMAGE WORKBENCH/SKYBOX>
        SB-PCL::.ARG1. = T
        SB-DEBUG::MORE = (:INPUT (#P"heart-in-the-sand/posx.jpg" #P"heart-in-the-sand/negx.jpg" #P"heart-in-the-sand/posy.jpg" #P"heart-in-the-sand/negy.jpg" #P"heart-in-the-sand/posz.jpg" #P"heart-in-the-sand/negz.jpg") ..)
  5: ((SB-PCL::EMF INITIALIZE-INSTANCE) #<unused argument> #<unused argument> #<TRIAL:IMAGE WORKBENCH/SKYBOX> :INPUT (#P"heart-in-the-sand/posx.jpg" #P"heart-in-the-sand/negx.jpg" #P"heart-in-the-sand/posy..
      Locals:
        SB-PCL::.ARG0. = #<TRIAL:IMAGE WORKBENCH/SKYBOX>
        SB-DEBUG::MORE = (:INPUT (#P"heart-in-the-sand/posx.jpg" #P"heart-in-the-sand/negx.jpg" #P"heart-in-the-sand/posy.jpg" #P"heart-in-the-sand/negy.jpg" #P"heart-in-the-sand/posz.jpg" #P"heart-in-the-sand/negz.jpg") ..)
  6: ((:METHOD MAKE-INSTANCE (CLASS)) #<STANDARD-CLASS TRIAL:IMAGE> :INPUT (#P"heart-in-the-sand/posx.jpg" #P"heart-in-the-sand/negx.jpg" #P"heart-in-the-sand/posy.jpg" #P"heart-in-the-sand/negy.jpg" #P"he..
      Locals:
        CLASS = #<STANDARD-CLASS TRIAL:IMAGE>
        SB-PCL::INITARGS = (:INPUT (#P"heart-in-the-sand/posx.jpg" #P"heart-in-the-sand/negx.jpg" #P"heart-in-the-sand/posy.jpg" #P"heart-in-the-sand/negy.jpg" #P"heart-in-the-sand/posz.jpg" #P"heart-in-the-sand/negz.jpg") ..)
  7: ((SB-C::TOP-LEVEL-FORM (TRIAL:ENSURE-INSTANCE (TRIAL:ASSET #1=(QUOTE ORG.SHIRAKUMO.FRAF.TRIAL.ASSETS:WORKBENCH) #2=(QUOTE TRIAL:SKYBOX) NIL) (QUOTE TRIAL:IMAGE) :INPUT (QUOTE (PATHNAME PATHNAME PATHNA..
      [No Locals]
  8: (SB-FASL::LOAD-FASL-GROUP #S(SB-FASL::FASL-INPUT :STREAM #<SB-SYS:FD-STREAM for "file C:\\msys64\\home\\selwyn\\portacle\\win\\asdf\\cache\\SBCL-2.0.0-Win32-X86-64\\C\\msys64\\home\\selwyn\\portacle\\..
  9: (SB-FASL::LOAD-AS-FASL #<SB-SYS:FD-STREAM for "file C:\\msys64\\home\\selwyn\\portacle\\win\\asdf\\cache\\SBCL-2.0.0-Win32-X86-64\\C\\msys64\\home\\selwyn\\portacle\\all\\quicklisp\\local-projects\\tr..
 10: ((FLET SB-FASL::THUNK :IN LOAD))
 11: (SB-FASL::CALL-WITH-LOAD-BINDINGS #<CLOSURE (FLET SB-FASL::THUNK :IN LOAD) {5EBD6FB}> #<SB-SYS:FD-STREAM for "file C:\\msys64\\home\\selwyn\\portacle\\win\\asdf\\cache\\SBCL-2.0.0-Win32-X86-64\\C\\msy..
 12: ((FLET SB-FASL::LOAD-STREAM :IN LOAD) #<SB-SYS:FD-STREAM for "file C:\\msys64\\home\\selwyn\\portacle\\win\\asdf\\cache\\SBCL-2.0.0-Win32-X86-64\\C\\msys64\\home\\selwyn\\portacle\\all\\quicklisp\\loc..
 13: (LOAD #P"C:/msys64/home/selwyn/portacle/win/asdf/cache/SBCL-2.0.0-Win32-X86-64/C/msys64/home/selwyn/portacle/all/quicklisp/local-projects/trial-vr/src/workbench.fasl" :VERBOSE NIL :PRINT NIL :IF-DOES-..
 14: (UIOP/UTILITY:CALL-WITH-MUFFLED-CONDITIONS #<CLOSURE (LAMBDA NIL :IN UIOP/LISP-BUILD:LOAD*) {100C7BD4EB}> ("Overwriting already existing readtable ~S." #(#:FINALIZERS-OFF-WARNING :ASDF-FINALIZERS)))
 15: ((SB-PCL::EMF ASDF/ACTION:PERFORM) #<unused argument> #<unused argument> #<ASDF/LISP-ACTION:LOAD-OP > #<ASDF/LISP-ACTION:CL-SOURCE-FILE "trial-vr" "src" "workbench">)
 16: ((LAMBDA NIL :IN ASDF/ACTION:CALL-WHILE-VISITING-ACTION))
 17: ((:METHOD ASDF/ACTION:PERFORM-WITH-RESTARTS (ASDF/LISP-ACTION:LOAD-OP ASDF/LISP-ACTION:CL-SOURCE-FILE)) #<ASDF/LISP-ACTION:LOAD-OP > #<ASDF/LISP-ACTION:CL-SOURCE-FILE "trial-vr" "src" "workbench">) [f..
 18: ((:METHOD ASDF/ACTION:PERFORM-WITH-RESTARTS :AROUND (T T)) #<ASDF/LISP-ACTION:LOAD-OP > #<ASDF/LISP-ACTION:CL-SOURCE-FILE "trial-vr" "src" "workbench">) [fast-method]
 19: ((:METHOD ASDF/PLAN:PERFORM-PLAN (T)) #<ASDF/PLAN:SEQUENTIAL-PLAN {10090718A3}>) [fast-method]
 --more--