The error message indicates that there is an issue determining the entity type for the Java action. Double-check that the entity type you are attempting to use is correctly defined and compatible with the Java action.
Attribute types for business events relate to attribute types of entities, but not all attribute types are supported for business events. The following attribute types are not supported:
In Studio Pro 9.24 and below, all types were supported implicitly because a business event was defined by an entity. The unsupported types were from the perspective of the consumer received as a string.