@ermalr
It’s difficult to say without more specific information about the layer in question, but it’s possible that it could be a format issue, a logic problem with Time Sculpting, or some other issue that’s not immediately apparent.
One technique that might help to find more detailed information would be to temporarily uncheck the “Suppress all After Effects notices, warning, and error dialogs” in the Templater Preferences panel. This option is meant to keep Templater running in the event that AE displays a dialog box, which would halt the reversioning process until it’s clicked away. This can sometimes result in a scenario where After Effects error dialogs are hidden during the layout and preview process. Temporarily unchecking this option may allow us to see a more detailed error message when the project is previewed, which could help us get a better idea of what’s going on.
However, it should be noted that as of the most recent release of Templater, all After Effects errors should be logged to the templater.err file, so this is less of an issue than it used to be. Based on the previously posted information, it seems the After Effects error is " An unexpected error occurred while exporting a composition." Unfortunately, this error is so vague that troubleshooting the issue would likely require much more information about the project file, the layer in question, and any dependent layers it might be referring to.
If unchecking that option in the Templater Preferences panel doesn’t change anything, it might be worthwhile to try removing any Time Sculpting and/or Expressions from the layer to see if that changes anything. Either way, with an error this vague, we would need to find out more information about how things are set up in order to make a better suggestion about what’s causing the issue.
Thanks,
Jeff