Does anybody know what is the problem?

When in doubt, B::Deparse it out

shell> perl -MO=Deparse -
open(GENERAL_LOG,">$generalFile");
close{GENERAL_LOG};

open GENERAL_LOG, ">$generalFile";
close *{{'GENERAL_LOG'}};
- syntax OK
[download]

So there you're passing an anonymous hash to close which it the tries to dereference as a glob and subsequently fails. As others have suggested you need to use parentheses instead of curly brackets.
HTH

_________
broquaint