Error parsing schema

Hello, 

Apologies if it's not the right place for this.

Trying to upload the schema markup to a blog page, but get a 'Error parsing schema' message. I have tried finding the mistake, but I no luck. Wonder if anyone can see it and explain it to me, please?

 <script type="application/ld+json">
{
  "@context": "https://schema.org",
  "@type": "Article",
  "mainEntityOfPage": {
    "@type": "WebPage",
    "@id": "https://www.eatplantsandtravel.com/laos-edition/vegan-food-guide-vientiane"
  },
  "headline": "Vegan Food Guide to Vientiane",
  "description": "Discover the best vegan food options in Vientiane, Laos. Explore a variety of plant-based dishes and restaurants to enhance your culinary experience in the city.",
  "datePublished": "2023-08-07",
  "dateModified": "2023-08-07",
  "author": {
    "@type": "Person",
    "name": "Parma"
  },
  "publisher": {
    "@type": "Organization",
    "name": "Eat Plants and Travel",
    "logo": {
      "@type": "ImageObject",
      "url": "https://www.eatplantsandtravel.com/logo.jpg",
      "width": 200,
      "height": 50
    }
  }
}
</script>
 

Many thanks!