What it means
The Out of script alert fires when a conversation reaches the moment of sale but no script is available for it: all your active scripts have already been used in this conversation, or contain a media item this fan has already seen (a free one as soon as it is sent, a paid one once unlocked), or no active script has media for this platform. See "How a conversation's script is chosen".
In other words: this fan has exhausted your catalog. It is good news in disguise, because it is your most engaged fans who trigger this alert.
What happens to the conversation
The conversation goes into awaiting intervention: the AI pauses on that specific conversation (the others continue normally) and you are notified on the Notifications page, and on Telegram if you have set up delivery.
How to restart the sale
Create or activate scripts for this model, with media this fan has not seen yet (see "Create a sales script").
Reopen the conversation and turn its automation back on.
The AI resumes, and at the fan's next sign of desire, the new script is selected.
In the meantime, you can also reply to the fan yourself from the conversation.
Keep it from happening again
Add scripts regularly, at the pace of your content production: every new script reopens a sales cycle with all the fans who had exhausted everything. See "How many scripts do you need?".