# Device already exists in OpManager - Why am I seeing this error?

When adding devices to OpManager manually, you might face an error saying "**Device already exists in OpManager.**". The reason you are faced with this error could be because:

- A device with same IP already exists in OpManager.
- A device with same name already exists in OpManager.
- Unique SysName might have be enabled. Generally, administrators choose to enable the SysName of devices under **Settings > Basic Settings > System Settings > Discovery > 'Unique System DisplayName'**. Probably, the newly added device has the same SysName of one of the existing devices.