fatal flex scanner internal error

Hi,

When I access the “Links” section in the wp-admin, I get the error message below:

Fatal error: fatal flex scanner internal error–no action found in /home/virtual/******/fst/var/www/html/wp-admin/link-manager.php on line 398

I am running the latest stable version, 1.5.1.

Any idea? I tried uploading new copies of the files but it’s no use.