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package Logger::Simple;
use strict;
...
  }
}
1;

Ambiguous call resolved as CORE::open(), qualify as such or use & at /
+opt/perl5/
lib/site_perl/5.6.0/Logger/Simple.pm line 88.
...

more lines follow ...

#!/opt/perl5/bin/perl
...
./locker.pl &
./writer.pl