Why does the Kivy app crash on my phone when using boto3, paramiko?

Question

Python

I have a small application that sends a command to AWS EC2 and runs code on it. Created application on Xubuntu virtual machine using python 3.6. On Windows everything works fine. I was also able to build other applications with Kivy and KivyMD on this VM.

Here is part of my custom file.

source.include_exts = py,png,jpg,kv,atlas
source.include_patterns = assets/*,amazon2.pem
requirements = kivy==1.11.1, kivymd, boto3, botocore, openssl, paramiko, urllib3, s3transfer

And the code itself:

from kivy.lang import Builder
from kivymd.app import MDApp
import kivy
import boto3
import paramiko
kivy.require('1.11.1')

KV = '''
Screen:
    MDRoundFlatIconButton:
        id: button
        text: "Start"
        font_size: "18sp"
        pos_hint: {"center_x": 0.5, "center_y": 0.15}
        on_release: app.start()

'''

class MainApp(MDApp):
    def build(self):
        return Builder.load_string(KV)

    def start(self):
        def lambda_handler():

            client = boto3.client('ec2', aws_access_key_id=aws_access_key, aws_secret_access_key=aws_secret_key,
                                  region_name='us-east-2')

            describeInstance = client.describe_instances()

            key = paramiko.RSAKey.from_private_key_file("amazon2.pem")

            ssh_client = paramiko.SSHClient()

            ssh_client.set_missing_host_key_policy(paramiko.AutoAddPolicy())

            ssh_client.connect(hostname="18.18.18.18", username="ubuntu", pkey=key)

            commands = [
                "python3 /home/ubuntu/server.py 'text'",
            ]

            print("Starting execution")
            for command in commands:
                print("Executing command: " + command)
                stdin, stdout, stderr = ssh_client.exec_command(command)
                print(stdout.read())
                print(stderr.read())

            print("finished execution")

        lambda_handler()

MainApp().run()

If you move

import boto3
import paramiko

into a function, then everything starts, but when you click on the button where these imports are involved, the application crashes
log.txt

Answer 1

Well, what does the program write?