I cannot save modifications on contact schema page

Hi!

after making any modification in contact schema page, it does not save change. The gif "loading" and nothing else happens.

This kind of problem began to me when I created a new type of page for a type of contact.

I send you a video as example: https://cl.ly/d6b2dbb6b7ce

I receive next error: Unable to cast object of type 'Terrasoft.Core.SchemaManagerItem`1[Terrasoft.Core.ClientUnitSchema]' to type 'Terrasoft.Core.ISchemaManagerItem`1[Terrasoft.Core.Entities.EntitySchema]'.

Any idea where can be the problem?

Waiting for your help, thanks a lot!