Ad Hoc Analysis Error 321

When attempting to send too many report requests simultaneously, such as loading a large saved project, Ad Hoc Analysis can return an Error 327. Normally this issue is temporary and subsides with time. However if your project consistently gets this error message, consider splitting your project into different categories or refresh your project one tab at a time.

If you have a reasonably-sized project that gets this error and does not work after 24 hours, have a Supported User contact Adobe Marketing Cloud Customer Care.