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This program not work correctly on linux

See original GitHub issue

Output error when execute python3 miner.py on terminal:

Traceback (most recent call last):
  File "/home/mateusfg7/Desktop/SimpleCoin/simpleCoin/miner.py", line 267, in <module>
    p2 = Process(target=node.run(), args=b)
  File "/usr/lib/python3/dist-packages/flask/app.py", line 990, in run
    run_simple(host, port, self, **options)
  File "/usr/lib/python3/dist-packages/werkzeug/serving.py", line 1052, in run_simple
    inner()
  File "/usr/lib/python3/dist-packages/werkzeug/serving.py", line 1005, in inner
    fd=fd,
  File "/usr/lib/python3/dist-packages/werkzeug/serving.py", line 848, in make_server
    host, port, app, request_handler, passthrough_errors, ssl_context, fd=fd
  File "/usr/lib/python3/dist-packages/werkzeug/serving.py", line 740, in __init__
    HTTPServer.__init__(self, server_address, handler)
  File "/usr/lib/python3.7/socketserver.py", line 452, in __init__
    self.server_bind()
  File "/usr/lib/python3.7/http/server.py", line 137, in server_bind
    socketserver.TCPServer.server_bind(self)
  File "/usr/lib/python3.7/socketserver.py", line 466, in server_bind
    self.socket.bind(self.server_address)
OSError: [Errno 98] Address already in use
Process Process-1:
Traceback (most recent call last):
  File "/usr/lib/python3.7/multiprocessing/process.py", line 297, in _bootstrap
    self.run()
  File "/usr/lib/python3.7/multiprocessing/process.py", line 99, in run
    self._target(*self._args, **self._kwargs)
  File "/home/mateusfg7/Desktop/SimpleCoin/simpleCoin/miner.py", line 112, in mine
    NODE_PENDING_TRANSACTIONS = json.loads(NODE_PENDING_TRANSACTIONS)
  File "/usr/lib/python3.7/json/__init__.py", line 348, in loads
    return _default_decoder.decode(s)
  File "/usr/lib/python3.7/json/decoder.py", line 340, in decode
    raise JSONDecodeError("Extra data", s, end)
json.decoder.JSONDecodeError: Extra data: line 1 column 5 (char 4)