This error can occur when the WishList Member Self Check finds inconsistencies in the WishList Member files uploaded to the server.
The WishList Member files may have been corrupted during upload. This can happen occasionally and is typically caused by FTP upload.
Simply re-upload WishList Member to resolve the issue.
The WordPress Plugin Uploader is recommended to upload WishList Member.
Note: The existing WishList Member will need to be removed first before it can be re-uploaded.