Here's how to fix a problem common to users of the Sony Ericsson Vivaz who can't log in to Facebook

QUESTION The Facebook app on my Sony Ericsson Vivaz smartphone isn't working. I can get online, but it won't let me log into Facebook, reporting the error message: 'unable to complete operation'. Cordarius Brown

HELPROOM ANSWER We haven't been able to replicate your problem to test this solution, but it's one that's been reported by other Sony Ericsson Vivaz users as successful. Launch the Facebook app and enter your username as normal, but type in a deliberately incorrect password. This will produce an error. Now enter the correct password, and your login should be successful.

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