Hi Toufiq,
I will look into it and try to contact the hosting provider, but unfortunately since it seems to be a code erreur, I don't think they will provide support for this error.
I tried with all dynamic items. I can select a source for dynamic filter and collection, where the source is a dropdown menu, but for the text and media, where the source is a "+" button, nothing happens.
Also, I put a dynamic collection on my page but nothing appears (I do have 1 item in the collection).
Are you sure you can't look more into it ? :D