perl -W hello.pl
*** PDFlib context pointer (nil) is invalid ***
*** PDFlib context pointer (nil) is invalid ***
*** PDFlib context pointer (nil) is invalid ***
*** PDFlib context pointer (nil) is invalid ***
Use of uninitialized value in die at hello.pl line 19.
hello: PDFlib Exception occurred:
Missing argument in printf at hello.pl line 44.
 Error: