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Introduction
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
http://www.wpbeginner.com/wp-tutorials/how-to-remove-the-login-shake-effect-in-wordpress/
This plugin removes the wp_shake_js function, and so eliminates the error.
Installation
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