Hello FB'rs

I am trying to update my old FB II engineering application 'Quench' to FB^3
Carbon. I have been using the Program Generator for the windows and the
menus etc. I am using a Mac 7300/Sonnet G3/500 MacOS 9.1, Carbonlib 1.6


I experience problems in my next function (unchanged from FBII)

In 'Quench.GLBL':

DIM @DataFolder%


In 'Quench.INCL':

CLEAR LOCAL 
DIM appVol%
LOCAL FN GetDataFolder%
'~'2
appVol% = SYSTEM (_aplVol)'Volume Application is on
DataFolder% = FOLDER (" Quench Data Files", appVol%)
END FN


The problem remains when I code:
DataFolder% = FOLDER (" Quench Data Files", 0)


When I Cmd-doubleClick on FOLDER in order to jump to the definition
I come in 'Subs Files.Incl' at the code:

//------- long = FOLDER(gFBStr&.FBStrAcc$,volume&) ----------//

LOCAL
DIM PBlk&,OsErr
RUNTIME Folder(volume&)
'
gFBStr&           = gFBStr& - 256'Pop String
PBlk&             = FN NewPtrClear(128)
PBlk&.ioVRefNum%  = volume&'Try Folder Vol
'
#if CarbonLib'Date { 10/28/01 }
fn FBWDtoPBWD(PBlk&)
#endif'Date { 10/28/01 }
'
<big snip>
END FN


It looks like kind of type mismatch; the string is missing in the definition
Am I doing something wrong?


Thank you in advance for any comment
Jan