Search pattern never detected in send_command_expect:

Hi Ktbyers, I am having an issue with my script . it does not write to my output file anything related to the command rather it give me me and error this is the error that i got

File “C:\Users\LEJDEFF\AppData\Local\Programs\Python\Python37\lib\site-packages\netmiko-2.3.3-py3.7.egg\netmiko\base_connection.py”, line 1320, in send_command_expect OSError: Search pattern never detected in send_command_expect: I

My script is as below

#!/usr/bin/env python
import netmiko
import sys
import datetime
from netmiko import ConnectHandler
from getpass import getpass

device = {
    'device_type': 'cisco_ios',
    'host': '172.24.237.130',
    'username': 'brunolepu401',
    'password': getpass(),
    
} 

net_connect = ConnectHandler(**device)
#open file to write command output
#file = open('_outputtexte', 'w')

# Execute commands
output = net_connect.send_command_expect('sh run', delay_factor=60)

# Write output to file above

filename = 'output' + '{0:%Y-%m-%d-%H-%M-%S}'.format(datetime.datetime.now()) + '.txt'
file = open(filename, 'w')
file.write(output)

#with open(filename) ad fh:
#line=fh.readline()
#line = fp.readline()
#   cnt = 1
#  while line:
#       print("Line {}: {}".format(cnt, line.strip()))
#       line = fp.readline()
#       cnt += 1

#print('Le nombre de sessions est de :',cnt )
file.close()

Can you please help Ktbyers