Hi Kunwar

Thanks for posting in the Lucid Community! Is it possible that the documents were shared with you and whoever shared them with you rescinded your access? If this is the case we would recommend reaching out to whoever owns the document to have them re-share it with you.

If this doesn't help could you please use this link to submit a support ticket so we can take a closer look? Please include a screenshot of the message you see when trying to access the document(s) and the URL of an example document you are seeing the issue with. This will help us investigate further.