get no info by $cgi->uploadInfo()

Hi,

I just want do upload a file whithin my CGI-script.
But when I try to check the MIME-Type of the uploaded file, the script breaks.
Here are the relevant code lines:


use CGI qw/:cgi :form -private_tempfiles/;
my $cgi = new CGI;

our $fh = $cgi->upload('fileupload');
if (not $fh) {
	# ERROR-handling
}
my $filename = $cgi->param('fileupload');
my $type = $cgi->uploadInfo($filename)->{'Content-Type'};


The error I get:

Can't use an undefined value as a HASH reference at /.../cgi-bin/uploadtest.cgi 
line 90.


The method uploadInfo() internally reports the content of $cgi->{.tmpfiles}. But 
when I dump the hash-structure of $cgi I see that the key '.tmpfiles' is missing:


CGI-object:
   .charset =	ISO-8859-1
   .fieldnames
   .header_printed =	1
   .parameters =	button,program,fileupload,screen
   .path_info =	
   .script_name =	/.../cgi-bin/uploadtest.cgi
   button =	Upload
   escape =	1
   program =	MathInd
   fileupload
  =	*Fh::fh00001AdressenPL_NGEE_MAT071207_rev.csv
   screen =	FineSelect


Whats going on there? What did I wrong?

Best Regards

Robert