The .module file references a non-existent config setting. I am sure it causes many issues, but in particular I experienced errors while trying to import content using single content sync:
[error] TypeError: in_array(): Argument #2 ($haystack) must be of type array, null given in in_array() (line 124 of /var/www/html/web/modules/contrib/ark/ark.module) #0 /var/www/html/web/modules/contrib/ark/ark.module(124): in_array('page', NULL)
The NULL comes from the evaluation of \Drupal::config('ark.settings')->get('ark_node_types')
So this error occurs when there is not setting for ark_node_types
Active
2.0
Code
Issue #3492342: Temporary fix for missing config setting