Hybris 2105.2 : Unable to load Editor Area for Backoffice ViewType

Hello,

After upgrading our application from hybris 2011.4 to 2105.2. View Types in backoffice stopped working. We are able to search for reports and list view is visible , however when we click on specific row in listview, backoffice throws the following exception.

ERROR [hybrisHTTP26] [DefaultWidgetInstanceManager] Error during send output de.hybris.platform.servicelayer.exceptions.ModelTypeNotSupportedException: No converter registered for model class class de.hybris.platform.util.ViewResultItem at de.hybris.platform.servicelayer.internal.converter.impl.DefaultModelConverterRegistry.getModelConverterByModelType(DefaultModelConverterRegistry.java:181) ~[coreserver.jar:?] at de.hybris.platform.servicelayer.internal.converter.impl.DefaultModelConverterRegistry.getSourceTypeFromModel(DefaultModelConverterRegistry.java:670) ~[coreserver.jar:?] at de.hybris.platform.servicelayer.internal.converter.impl.DefaultModelConverterRegistry.getModelConverterByModel(DefaultModelConverterRegistry.java:650) ~[coreserver.jar:?] at de.hybris.platform.servicelayer.internal.model.impl.DefaultModelService.getModelConverterByModel(DefaultModelService.java:993) ~[coreserver.jar:?] at de.hybris.platform.servicelayer.internal.model.impl.DefaultModelService.isRemoved(DefaultModelService.java:490) ~[coreserver.jar:?] at

Complete stack trace attached : backoffice.txt

Steps to re produce this issue is as follows

1. Search for Report Definitions in explorer tree
2. Select any report definition (Note : This issue is reproducable for all OOB hybris reports definitions as well)
3. Click on search by type
4. Select any item from the listview
5. Backoffice will throw exception and editor area is empty

Any ideas or help would be appreciated.

Kind Regards

Faisal