#REMEBERED TO CHANGE THE MODULE NAME HERE
use Module::With::New::PackageName;


sub generate{

  #open a temp file.

  my $workbook = Spreadsheet::WriteExcel->new( $filehandle );

  #PROGRAM DOES NOT REACH THIS POINT!

  write_form( ... );

  #close the sheet.

  #open the temp file and return the content as a string.

}

sub write_form{

  #do something

  #FORGOT TO REPLACE NAME HERE
  Module::With::Old::PackageName::perform_action();

  #do some more
}