Full error message from CMS follows:
"SQLSTATE[42000]: Syntax error or access violation: 1170 BLOB/TEXT column 'slug' used in key specification without a key length (SQL: alter table `initbiz_cumuluscore_clusters` add unique `initbiz_cumuluscore_clusters_slug_unique`(`slug`))" on line 664 of D:\Projects\Merki.Online\vendor\laravel\framework\src\Illuminate\Database\Connection.php
MySQL version 5.6.26 for Win64