The tablespace file was deleted causing Oracle to fail to start

Tablespace gti40_data01 data File gti40_data01.dbf I deleted it.

I'll run the drop tablespace qwer again.

Will error

ORA-01116: Error opening database file 48 o'clock

ORA-01110: Data file: '/DATA/GTI40_DATA01.DBF '

ORA-27041: Unable to open file

Linux error:2: No such file or directory

Additional Information:3

How can I delete this tablespace?

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1.shutdown Immediate

2.startup Mount

3.alter database datafile ' xxx ' offline drop;

4.alter Database Open

5.drop tablespace xxxx including contents and datafiles;

The tablespace file was deleted causing Oracle to fail to start