Refer to the following case for more details:

Case # 00674899 : Getting error when running code from second time onwards 

My code:

import sys
import paramiko
sys.path.append("C:\\Program Files (x86)\\SmartBear\\TestComplete 15\\Bin\\Extensions\\Python\\Python311")
sys.path.insert(0,"C:\\Program Files (x86)\\SmartBear\\TestComplete 15\\Bin\\Extensions\\Python\\Python311\\Lib")
def test():
ssh = paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh.close()

When I run the code first time no errors. From second time onwards, getting the following error:
ImportError: PyO3 modules compiled for CPython 3.8 or older may only be initialized once per interpreter process 11:31:05 Normal 0.00

Response from support team:

The issue you are getting appears when working with third-party Python packages in TestComplete, and this is mentioned in our docs " We do not guarantee stable work of your script tests that use third-party Python packages. When you run such tests, you may experience unexpected errors or TestComplete can stop responding"

For reference: https://support.smartbear.com/testcomplete/docs/scripting/specifics/python.html#:~:text=We%20do%20not%20guarantee%20stable%20work%20of%20your%20script%20tests%20that%20use%20third%2Dparty%20Python%20packages.%20When%20you%20run%20such%20tests%2C%20you%20may%20experience%20unexpected%20errors%20or%20TestComplete%20can%20stop%20responding.

I saw that you are trying to use Paramiko to create an SSH connection, but it's a third-party package which does not work with TestComplete Python Engine.