What Is The Issue?
When copying or creating creatives for A/B testing, the operation may fail and you may encounter the following error message:
Error Specified list/container must not contain any null elements
What Causes The Issue?
This problem is a result of copying or creating image creatives without uploading images. And it is most commonly caused in one of the following situations:
- When copying image creatives from one group to another by using the Copy function.
- When creating new image creatives for A/B testing.
How To Fix The Issue
You should re-create any image creatives and upload the images to the platform. Then delete the creatives in Sync Error.
Note: If performing an A/B testing, you will need to create two image creatives within the same group and set the creatives to rotate evenly.
