UI Designer not working, doesn't have any widget

Hello, i am trying to use Bonita bpm but i cant get it working. When i opened ui designer i cant create custom widget, i get json error, when i opened form Application Page or Process form there is no widget loaded.
When i create diagram and select and create form from ui designer it opens ui designer but it gets error "Could not load component, unexpected structure in the file [pbContainer.json]" and gets blank page.