NOTE: we are currently investigating an issue affecting some videos scheduled to Instagram, which throw this error. More information here.
A potential error is when we have tried to post something for you, but we're not quite sure that it posted.
Because of how we work, we need to be careful not to post duplicate photos on customers' profiles - understandably, you'd be pretty angry if we did that! So when we detect some kind of problem with a post after we have clicked the upload button in the Instagram app, we don't always automatically re-queue that post to be retried on another device.
If we know it was a problem (for example Instagram says the network connection dropped out) it will be retried, but in other situations we can't be certain.
When this occurs, we send an email to people specified to receive error emails (if you haven't set anyone, this will be the Schedugram administrator - but you can define who should receive error emails for each of your Instagram accounts in manage accounts > account settings) with more information. If "send potential error emails" is off, then we won't send potential error emails obviously, so check that the setting is enabled as well.
You just need to check your profile to see if it's posted, and if it isn't, then you can either post it manually or go to your archive and click "post again" to reschedule the post.
You can also see if something is a potential error in your archives - a warning symbol will be displayed.
Luckily we don't see very many of these potential errors, but if your account is getting a lot of them, please reach out to our support team and we can see if there is something else happening.