The following field is invalid: filename

on create new post or duplicate it throws error ("The following field is invalid: filename")

const Posts: CollectionConfig = {
    slug: 'posts',
    admin: {
        defaultColumns: ['title', 'author', 'category', 'tags', 'status'],
        useAsTitle: 'title',
    },
    access: {
        create: () => true,
        read: () => true, //isAdminOrSelf,
        delete: isAdminOrSelf,
        update: isAdminOrSelf
    },
    fields: [
       ...
        {
            type: 'tabs',
            tabs: [
                {
                    label: 'Hero',
                    description: 'This will appear within the tab above the fields.',
                    fields: [
                        {
                            name: 'title',
                            type: 'text',
                            required: true,
                        },
                        {
                            name: 'slug',
                            label: 'Slug',
                            type: 'text',
//                            required: true,
                            unique: true,
                            admin: {
                                position: 'sidebar',
                            },
                            hooks: {
                                beforeValidate: [
                                    formatSlug('title'),
                                ],
                            },
                        },
                        {
                            name: 'postImage',
                            type: 'upload',
                            relationTo: 'media',
                            required: true,
                        }

                    ]
                },
            ]
        },
    ],
}