spatie media library Image source not readable when watermark

laravel 8

php 8

"spatie/laravel-medialibrary": "^9.0.0",

'image_driver' => env('IMAGE_DRIVER', 'gd'),

model :

				 public function registerMediaCollections(): void
{
    $this->addMediaCollection('photo')
        ->useFallbackUrl(asset('no-image.jpg'))
        ->useFallbackPath(public_path('no-image.jpg'))
        ->acceptsMimeTypes(['image/jpeg', 'image/png', 'image/webp', 'image/svg', 'image/jpg', 'image/gif'])
        ->onlyKeepLatest(10)
        ->registerMediaConversions(function (Media $media) {

            $this
                ->addMediaConversion('sm')
                ->width(348)
                ->height(273)
                ->watermark(public_path('unnamed.png'))
                ->watermarkOpacity(45)
                ->watermarkPosition(Manipulations::POSITION_BOTTOM_LEFT)      // Watermark at the top
                ->watermarkHeight(13, Manipulations::UNIT_PERCENT)    // 50 percent height
                ->watermarkWidth(21, Manipulations::UNIT_PERCENT)
                ->watermarkPadding(15)
                ->sharpen(10)
            
                ->format('webp')
                ->nonQueued();

            $this->addMediaConversion('md')
                ->width(1200)
                ->height(800)
                ->watermark(public_path('unnamed.png'))
                ->watermarkOpacity(35)
              
                ->watermarkPosition(Manipulations::POSITION_BOTTOM_LEFT)      // Watermark at the top
                ->watermarkHeight(15, Manipulations::UNIT_PERCENT)    // 50 percent height
                ->watermarkWidth(21, Manipulations::UNIT_PERCENT)
                ->watermarkPadding(30)
                ->sharpen(10)
                
                ->format('webp');
            $this->addMediaConversion('lg')
                ->sharpen(10)
                ->format('webp')
                ->nonQueued();
        });

}

The error only occurs when using watermark

Error:

        Intervention\Image\Exception\NotReadableException
        Image source not readable