Thank you. There's some progress (the ns hierarchy is created) but I still get an error:
]link.create x c:\src\apl\apl_exercises
Linked: #.x ←→ c:\src\apl\apl_exercises
ERRORS ENCOUNTERED:
2 import(s) failed:
c:\src\apl\apl_exercises\problems_tryapl\2013\1.aplf
c:\src\apl\apl_exercises\problems_tryapl\2013\2.aplf