First time asking on stackoverflow, please bear with me
Context: Blog web application backend.
Spring Boot version: 3.2.3
Modelmapper dependency version: 3.1.1
Build tool: Maven
Error: ModelMapper mapping errors:rnrn1) Converter org.modelmapper.internal.converter.MergingCollectionConverter@bd5c6b3 failed to convert org.hibernate.collection.spi.PersistentSet to java.util.Set.rnrn1 error

I am working on comment api. I want that, when I fetch a post, it will also show the comments.
I have a class PostResponse which contains list of PostDto, along with pagination details. I have created a method createPostResponse inside a class PostServiceImpl.java which is responsible for the mapping.

createPostResponse method:

PostResponse.java:

PostDto.java:

Posts.java:

Comments.java:

MyUserResponse.java:

MyUser.java:

Note: I have used setter getter annotations for all the classes.