I created and deployed a SharePoint framework WebPart in the app catalog. Then I added the WebPart in a page of the top level of a site collection. Its working fine in top level site collection pages. But I am not able to add the same WebPart in a page which is under a subsite not top level site collection. Tried adding the app in subsite but showing the error saying that app already added. But I have added the app only in the top level of a site collection, not in the subsite.
Please help me on this issue as soon as possible.