Another issue that the above posts touch on is your use of package variables. When you refer to $MAIN::Log, that is being treated as the variable called $Log in the package MAIN. This has nothing to do with your declaration MAIN:, which is merely creating a line label that you could use in a next or last statement. If you really want a package, you should declare it with package MAIN;. But I think a better idea, would be to put your decalarations like this:

my $Log;
my $LogMsg;
my $StdErr;
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at the very top of your program outside any blocks. Then remove all the MAIN:: references everywhere you have them now.