Database connectivity issue

[Princysaini]

Hi,
pls check the issue, how can I solve this? pls, let me know.

Traceback (most recent call last):
  File "/opt/software/applications/miniconda3/lib/python3.7/site-packages/pandas/io/sql.py", line 2056, in execute
    cur.execute(*args, **kwargs)
sqlite3.OperationalError: disk I/O error

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "DDIMDL.py", line 387, in <module>
    main(args)
  File "DDIMDL.py", line 333, in main
    df_drug = pd.read_sql('select * from drug;', conn)
  File "/opt/software/applications/miniconda3/lib/python3.7/site-packages/pandas/io/sql.py", line 608, in read_sql
    chunksize=chunksize,
  File "/opt/software/applications/miniconda3/lib/python3.7/site-packages/pandas/io/sql.py", line 2116, in read_query
    cursor = self.execute(*args)
  File "/opt/software/applications/miniconda3/lib/python3.7/site-packages/pandas/io/sql.py", line 2068, in execute
    raise ex from exc
pandas.io.sql.DatabaseError: Execution failed on sql 'select * from drug;': disk I/O error