Getting an error with mailchimp plugin
A CiviCRM group is mapped to the list ID of a Mailchimp list or interest which is not available (deleted on Mailchimp, or belonging to another Mailchimp API key, or ...). Review the groups which are syncing to Mailchimp, and make sure each one of those connects to a current / valid List or Group in Mailchimp.

There are DB tables you might be able to identify the specific group ID from. Look in civicrm_value_mailchimp_settings

mysql&gt; select * from civicrm_value_mailchimp_settings;
+------+-----------+------------+----------------+-------------+-----------------------+
| id   | entity_id | mc_list_id | mc_grouping_id | mc_group_id | is_mc_update_grouping |
+------+-----------+------------+----------------+-------------+-----------------------+
|    1 |       123 | aabbccddee |                |             |                  NULL |
|    2 |       124 | 1122334455 | beadbeadbe     | aceaceacea  |                     1 |
|    3 |       125 | 9988776655 | facefacefa     | deadeddead  |                     1 |
+------+-----------+------------+----------------+-------------+-----------------------+


The column entity_id is the relevant CiviCRM Group ID, and you'll see e33355b9f6 in one of your other columns I expect.