The Course structured data apparently doesn't contain the offers field described here, and Google has invalidated the objects.
Example of course info:
<script type="application/ld+json">{"@context":"https://schema.org","@type":"Course","name":"The Kotlin Bundle","description":"Everything you need to become an expert Kotlin developer. Master Kotlin through clear lessons, practical exercises, and a smooth learning curve. Ideal for those with some programming experience, this bundle will take you from zero to hero.","image":{"src":"/_astro/the-kotlin-bundle.C2GOdkLI.png","width":1500,"height":844,"format":"png","fsPath":"/opt/buildhome/repo/src/content/courses/the-kotlin-bundle/images/the-kotlin-bundle.png"},"provider":{"@type":"Organization","name":"Rock the JVM","url":"https://rockthejvm.com/"},"isAccessibleForFree":false,"hasCourseInstance":[{"@type":"CourseInstance","courseMode":"Online","courseWorkload":"PT31H","instructor":[{"@type":"Person","name":"Kai S.","description":"Professor at X-University","image":"http://examplePerson.jpg"}]}]}</script>
The
Coursestructured data apparently doesn't contain theoffersfield described here, and Google has invalidated the objects.Example of course info: