mongo export says I need to give a collection but I did code example

Example 1: mongodb export entire database

// EXPORT
mongodump -d <database_name> -o <directory_backup>
// IMPORT
mongorestore -d <database_name> <directory_backup>

Example 2: mongoexport whole database

mongodump --uri="mongodb://YOUR_USER_ID:YOUR_PASSWORD@YOUR_HOST_IP/YOUR_DB_NAME" --gzip --archive > YOUR_FILE_NAME