This means that there seems to be a mismatch between the language used in your title, thumbnail (includes GIF’s and video stills) and the language used in your landing page content. Alternatively, there seems to be a mismatch between the language used in your title and the language used in your thumbnail or video creative.
Example: You submitted a campaign that has French titles and a landing page that is in Portuguese.
Example: You submitted a campaign that has English titles and a thumbnail that shows text in Hindi.
How To Fix This
Create a new campaign and ensure that there is consistency in the language between your title (or thumbnail, GIF, or video creative, if applicable) and the content of your landing page.
To learn more about this rejection reason, click here.
To learn how to fix and resubmit your campaign or campaign ad, click here.