java.lang.IllegalArgumentException: AsyncPagedListDiffer cannot handle both contiguous and non-contiguous lists

I'm using android jetpack paging library. and I have the following observer on my MVVM.
observer = new Observer<PagedList<Problem>>() {

        @Override
        public void onChanged(PagedList<Problem> problems) {
            Log.d(TAG, "onViewCreated: adapter size = " + problems.size());

            adapter.submitList(problems);
        }

    };

now I'm retrieving some data from the database and I want to submit a List<Problems> to the adapter.
I did some research and found a way of converting a List of Object to a PagedList.
The problem is that whenever I try to submit a new list I get the following Error message :
java.lang.IllegalArgumentException: AsyncPagedListDiffer cannot handle both contiguous and non-contiguous lists.
so, is there's any way that I could change my PagedList into a Conteguos PagedList ? I think the answer is to make my PagedList a PagedList with a single Page. any help please?.

In Paging2, a PagedList is either contiguous or tiled, to handle cases where a user may scroll far into placeholders and instead of loading many pages adjacently, you want to be able to "jump" to that position and resume loading from there.

So in order for a PagedList to be tiled, it must both:

1. Come from a DataSource which overrides:

@Override
boolean isContiguous() {
    return false;
}

2. Placeholders must be enabled via PagedList.Config.enablePlaceholders as doing so basically opts you into tiling behavior (if it is supported).

The error you're seeing is basically a warning that you're trying to support the fast-scroll / jumping case, but using a DataSource which only supports loading adjacent pages.

If you haven't checked it out yet, I would recommend trying out Paging3, as it does away with the entire tiling thing and generalizes the concept of jumps to all types of DataSources by generalizing them to a single PagingSource type that explicitly opts in and defines jumping behavior.

Also, since you hinted that you're fetching data from DB to submit as a static list - the common way to do this via something like Room or SqlDelite would be to use their built-in Paging support to generate a DataSource.Factory implementation directly.