Fatal error: Call to undefined function _ds_inception_get_overrides()
When Drupal runs its cron tasks, it runs also every implementation of hook_cron() made from every module, including the core ones. Those implementation can then invoke other hooks, even the ones implemented by modules not implementing hook_cron().

The error you are showing is caused from the module whose machine name is ds_inception. Whenever it is implementing hook_cron() or one of the hooks invoked from hook_cron(), you need to disable that module.  

I cannot tell you the name of the module you read in the page listing all the enabled modules, since I didn't find any third-party module with that machine name hosted on drupal.org. I thought it was a sub-module of the Display Suite module, but the 7.x-1.x branch doesn't contain such module, nor does the 7.x-2.x branch. It could also be a custom module developer for that site.
You can still find the readable name of the module in the ds_inception.info file, if you find one. It's the one following name = in that file.