This is not the proper content of this line. It should read
In other words: Your lib-common.php is corrupted. I can only asssume that you used either WinZip to unpack the tarball or Dreamweaver to edit lib-common.php. Both programs are known to corrupt the lib-common.php (and it's even mentioned in the installation instructions).
You should get a fresh copy of that file.
bye, Dirk