Unable to delete a DSO

I'm fairly new to BW and was doing a mock exercise.

I started created a DSO - added couple of characteristics and a time characterstic. Then I tried deleting the DSO but it gave me an error log.

Could not instantiate BW object for external SAP HANA view and

Error when deleting object DataStore Object (classic) BWSALES

Can someone advise how do I delete it?