Overlapping slots
Fix the publishing error when two dates or two time ranges of an Activity overlap.
An Activity can't run two sessions at once. Validation lists every overlap in one pass, so you can fix them all before publishing again.
"has overlapping specific dates"
The message names both dates, for example Date #2 (03/10/2026 10:00-11:30) overlaps with Date #3.
Why this happens: two rows under Specific Dates share some time. A duplicated row, or a session stretched without moving the next one, usually causes it.
Fix it:
- In the Activity's Slots tab, open Dates > Specific Dates.
- Find the two rows the message names.
- Change the times so one ends before the next starts, or delete the duplicate.
- Save, then publish again.
"has overlapping time ranges on" a weekday
Why this happens: two ranges on the same weekday share some time. Different days never conflict: Monday and Tuesday can share the same hours.
Fix it:
- In Dates > Weekly, open the weekday the message names.
- Change the ranges so one ends before the next starts, or remove one.
- Save, then publish again.
After changing Duration (minutes) or Buffer between slots, review the schedule again before publishing.
Still stuck?
Contact your Customer Success Manager with the campaign and Activity names and the full message.