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The plugins ‘Theme-my-login’ and ‘Buddyppress’ when combined cause an error message to appear similar to
Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘wp_shake_js’ not found or invalid function name in /home/(your url)/public_html/wp-includes/plugin.php on line 503
The line number will vary on different versions of wordpress
The function that is erroring is actually a wordpress one (wp_shake_js) , and causes wp to ‘shake’ when an incorrect username is entered – see the attached link for an explanation and demo
This plugin removes the wp_shake_js function, and so eliminates the error.
1. Download this plugin using the link above, noting the folder on your PC where you download it to.
2. Go to Dashboard>plugins>add new
3. Click Upload, and select the file ‘tml-fix.zip’ from the folder you downloaded it to
4. Click install
5. and then activate