I started to get this error after updating the plugin to 1.16.7 when I'm trying to edit a custom taxonomy term channel:
PHP Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, class RWMB_File_Field does not have a method "post_edit_form_tag" in ...../wp-includes/class-wp-hook.php:308
Stack trace:
#0 ...../wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters('', Array)
#1 ...../wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#2 ...../wp-admin/edit-tag-form.php(111): do_action('channel_term_ed...')
#3 ...../wp-admin/term.php(74): require('...../S...')
#4 {main}
thrown in ...../wp-includes/class-wp-hook.php on line 308
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