mondalsoumen86 In HTML, the <body> tag is typically the parent container that holds all the visible content of a webpage. According to the error message, the <body> tag should have only one direct child element. However, the specific tag mentioned in the error, <amp-story>, is not allowed to have any sibling tags.
In simpler terms, it means that within an AMP document, you cannot have multiple elements at the same level as the <amp-story> tag. The <amp-story> tag should be the only direct child of the <body> tag in order to comply with the AMP guidelines.
To resolve this error, you need to ensure that the structure of your HTML document adheres to the requirements of the AMP specification. Make sure that the <amp-story> tag is the only immediate child of the <body> tag and remove any other sibling tags from the same level.