Explain error

[Freeman Gilmore]

Could someone explain why I get this error?
It compiles correctly.

Thank you, fg

\version "2.19.83"
#((define h (make-hash-table 114))
(display h)
(hashq-set! h 3 "val3")
(display (hashq-ref h 3)))

~~~~~~~~~~~~~~~~~~~~~~~~~~

Starting lilypond-windows.exe 2.19.83 [Untitled]...
Processing 
`C:/Users/GDC60~1/AppData/Local/Temp/frescobaldi-m977uzam/tmpo2az46ch/document.ly'
Parsing...
C:/Users/GDC60~1/AppData/Local/Temp/frescobaldi-m977uzam/tmpo2az46ch/document.ly:3:2:
error: GUILE signaled an error for the expression beginning here
#
((define h (make-hash-table 114))

#<hash-table 0/223>val3
Wrong type to apply: #<unspecified>
fatal error: failed files:
"C:\\Users\\GDC60~1\\AppData\\Local\\Temp\\frescobaldi-m977uzam\\tmpo2az46ch\\document.ly"
Exited with return code 1.