Without seeing the error output I can only think that its because you are using taint but are not then untainting the variables you read in. ie:

 # This var is not untainted
 my $quote = $q->param("submitedquote");
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I'd also read Ovids tutorial. for more hints on CGI stuff.

Its also possible that you cannot open the file and your die statement has informed you of that. Take a look at your logs for more info.