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installation problem of MySQL on OS Lion

I installed MySQL on a Mac Pro running OS Lion.

The installation was successful, but starting the mysql server generated the following error message:

Martin-Muellers-Mac-Pro:~ martin$ sudo /usr/local/mysql/support-files/mysql.server start
Starting MySQL
....... ERROR! Manager of pid-file quit without updating file.

I'll be grateful for any help

Martin Mueller
Professor emeritus of English and Classics
Northwestern University