Laravel nova doesn't find the BelongsTo recourse, even though it exists.

I have two nova resources Here is the the account address resource

class AccountAddress extends Resource
{
    /**
     * The model the resource corresponds to.
     *
     * @var string
     */
    public static $model = \App\Models\AccountAddress::class;

    /**
     * The single value that should be used to represent the resource when being displayed.
     *
     * @var string
     */
    public static $title = 'id';

    /**
     * The columns that should be searched.
     *
     * @var array
     */
    public static $search = [
        'id',
    ];

    /**
     * Get the fields displayed by the resource.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return array
     */
    public function fields(Request $request)
    {
        return [
            ID::make()->sortable(),

            BelongsTo::make('Address Type', 'addressType', \App\Nova\AddressTypeMaster::class),
            BelongsTo::make('Location', 'location', \App\Nova\LocationMaster::class),
            BelongsTo::make('Street', 'street', \App\Nova\StreetMaster::class),
            BelongsTo::make('City', 'city', \App\Nova\CityMaster::class),
            BelongsTo::make('State', 'state', \App\Nova\StateMaster::class),
            BelongsTo::make('Zip', 'zip', \App\Nova\ZipcodeMaster::class),

When I try to load this in the browser I'm getting this error

Undefined constant: "App\Nova\StateMaster"

Undefined constant: "App\Nova\LocationMaster"

Here is the State master Resource

class StateMaster extends Resource
{
    /**
     * The model the resource corresponds to.
     *
     * @var string
     */
    public static $model = \App\Models\StateMaster::class;

    /**
     * The single value that should be used to represent the resource when being displayed.
     *
     * @var string
     */
    public static $title = 'state_id';

    /**
     * The columns that should be searched.
     *
     * @var array
     */
    public static $search = [
        'state_id',
    ];

    /**
     * Get the fields displayed by the resource.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return array
     */
    public function fields(Request $request)
    {
        return [
            ID::make('state_id')->sortable(),

            Number::make('State id')
                ->rules('required', 'integer'),

            Text::make('Country id')
                ->rules('required', 'string'),

            Text::make('State code')
                ->rules('required', 'string'),

            Text::make('State name')
                ->rules('required', 'string'),

            Number::make('Status')
                ->rules('required', 'integer'),


        ];
    }

Here is the relationship on the model

public function location(): BelongsTo
    {
        return $this->belongsTo(LocationMaster::class, 'location', 'location_id');
    }

    public function state(): BelongsTo
    {
        return $this->belongsTo(StateMaster::class, 'state', 'state_id');
    }