It looks like from your bug report that you are on MySQL 5.0 or less, because the "table_open_cache" variable could not be found. If you delete the line with "table_open_cache" from the tuner-default.cnf, the problem should go away.
The fix is to have 2 files -- one for 5.1 and one for 5.0 and less...
This is because the tuner-default.cnf has both:
table_open_cache
table_cache
It looks like from your bug report that you are on MySQL 5.0 or less, because the "table_open_cache" variable could not be found. If you delete the line with "table_open_cache" from the tuner-default.cnf, the problem should go away.
The fix is to have 2 files -- one for 5.1 and one for 5.0 and less...