Can't install Performance Schema helper schema (sys) (1 reply)

I'm using MySQL 5.6.17 on Mac OS X 10.9.3 with MySQL Workbench 6.1.6. If I click on "Performance Reports" or "Performance Schema Setup", I get a message stating "The Performance Schema helper schema (sys) is not installed". I click the "Install Helper" button and I get the following message:

Error installing sys Schema.
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)

However, since I'm using root, with all permissions assigned to root that I've ever seen or heard of, I'm not sure what to do from this point.

Any suggestions?

Thanks,
- Andrew.