Issue in connecting Database about insights HOT 5 CLOSED

Traceback (most recent call last):
  File "apps/insights/insights/insights/doctype/data_source/data_source.py", line 411, in connect_to_db
    yield db
  File "apps/insights/insights/insights/doctype/data_source/data_source.py", line 88, in execute_query
    result = db.sql(query, **kwargs)
  File "apps/frappe/frappe/database/database.py", line 209, in sql
    self._cursor.execute(query, values)
  File "env/lib/python3.10/site-packages/pymysql/cursors.py", line 148, in execute
    result = self._query(query)
  File "env/lib/python3.10/site-packages/pymysql/cursors.py", line 310, in _query
    conn.query(q)
  File "env/lib/python3.10/site-packages/pymysql/connections.py", line 548, in query
    self._affected_rows = self._read_query_result(unbuffered=unbuffered)
  File "env/lib/python3.10/site-packages/pymysql/connections.py", line 775, in _read_query_result
    result.read()
  File "env/lib/python3.10/site-packages/pymysql/connections.py", line 1156, in read
    first_packet = self.connection._read_packet()
  File "env/lib/python3.10/site-packages/pymysql/connections.py", line 725, in _read_packet
    packet.raise_for_error()
  File "env/lib/python3.10/site-packages/pymysql/protocol.py", line 221, in raise_for_error
    err.raise_mysql_exception(self._data)
  File "env/lib/python3.10/site-packages/pymysql/err.py", line 143, in raise_mysql_exception
    raise errorclass(errno, errval)
pymysql.err.OperationalError: (1046, 'No database selected')