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An invalid implementation mymodule_form_alter was added by hook_module_implements_alter

I am trying to have my module alter menu_ui functions. Changing my module’s weight didnt help and I read that hook_module_implements_alter is the way to go. So, as described here I am appending my module to the end of the implementations:

/**  * Implements hook_module_implements_alter.  */ function mymodule_module_implements_alter(&$implementations, $hook) {   if ('form_alter' == $hook) {     $group = $implementations['mecca_hierarchy_access'];     unset($implementations['mecca_hierarchy_access']);     $implementations['mecca_hierarchy_access'] = $group;   } }

But this just throws:

Uncaught PHP Exception RuntimeException: “An invalid implementation mymodule_form_alter was added by hook_module_implements_alter()” at /path/to/core/lib/Drupal/Core/Extension/ModuleHandler.php line 591

My form alter looks like this:

function mymodule_form_node_form_alter(&$form, FormStateInterface $form_state) {   // commented code }

What do I do wrong?

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An invalid implementation mymodule_form_alter was added by hook_module_implements_alter

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