I tried removing the use SUBS statement, but I received the following:

BEGIN not safe after errors--compilation aborted at
db.cgi line 1035.
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Line 1035 is: chdir("$file_dir");
However, I also received error messages like:

Global symbol "$var" requires explicit package name at
db.cgi
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The "$vars" are those I have declared in @EXPORT and use var in SUBS.
Stacy.