Custom Field Types in Form Builder Plugin

I believe I'm following the docs properly, and I'm getting this error.

Here's the field schema:

const fields: Field[] = [
  {
    type: "row",
    fields: [
      {
        name: "name",
        label: "Name (lowercase, no special characters)",
        required: true,
        type: "text",
      },
      {
        name: "label",
        type: "text",
      },
    ],
  },
  {
    type: "row",
    fields: [
      {
        name: "width",
        type: "number",
      },
      {
        name: "defaultValue",
        type: "text",
      },
    ],
  },
  {
    name: "options",
    type: "array",
    fields: [
      {
        type: "row",
        fields: [
          {
            name: "label",
            type: "text",
          },
          {
            name: "value",
            type: "text",
          },
        ],
      },
    ],
  },
];

Here's how I'm using it with the plugin

Fixed, Basically the type for multiselect should be a Block, meaning I was missing the slug proerty