Hi,
Your ListBox_Lib.ppl library seems to have miss out the implementation of the function 'LISTBOX_CLEARITEMS'. I paste the error log below.
-- Content of errorlog.txt --
PPL compiler v.0.8
Filename : C:\Program Files\Pocket Programming Language\PPL\Projects\Test\Test.ppl
Parsing...
** (ListBox_lib.ppl) Syntax error at 'LISTBOX_CLEARITEMS' (78,910)
(40 ms)
Compiling... (0 ms)
Completion time (40 ms)
** 1 error(s)
Lee