How did you build this? The issue is wrong version is reference. You can
eliminate this error by opening the Manifest file in the OSGI bundle and
remove version. Then the bundle will pick up version AEM exposes.
You need to use Sling Models. You can find the answer in this AEM HELPX
COMMUNITY Article: Adobe Experience Manager Help | Creating a HTL
Repeating Data Set 6.4 Component that uses Sling Models Hope this
helps...
This article shows you exactly how to interate through a collection
(Multifield) using HTL:Adobe Experience Manager Help | Creating a HTL
Repeating Data Set 6.4 Component that uses Sling Models