TypeError: a bytes-like object is required, not 'str'

RESTART: C:/Program Files (x86)/Microsoft Visual Studio/Shared/Python36_64/server.py
Waiting for connection…

RESTART: C:/Program Files (x86)/Microsoft Visual Studio/Shared/Python36_64/server.py
Waiting for connection…
Exception in thread Thread-1:
Traceback (most recent call last):
File “C:\Program Files (x86)\Microsoft Visual Studio\Shared\Python36_64\lib\threading.py”, line 916, in _bootstrap_inner
self.run()
File “C:\Program Files (x86)\Microsoft Visual Studio\Shared\Python36_64\lib\threading.py”, line 864, in run
self._target(*self._args, **self._kwargs)
File “C:/Program Files (x86)/Microsoft Visual Studio/Shared/Python36_64/server.py”, line 9, in tcplink
sock.send(‘Welcome!’)
TypeError: a bytes-like object is required, not ‘str’

RESTART: C:/Program Files (x86)/Microsoft Visual Studio/Shared/Python36_64/server.py
Waiting for connection…
Exception in thread Thread-1:
Traceback (most recent call last):
File “C:\Program Files (x86)\Microsoft Visual Studio\Shared\Python36_64\lib\threading.py”, line 916, in _bootstrap_inner
self.run()
File “C:\Program Files (x86)\Microsoft Visual Studio\Shared\Python36_64\lib\threading.py”, line 864, in run
self._target(*self._args, **self._kwargs)
File “C:/Program Files (x86)/Microsoft Visual Studio/Shared/Python36_64/server.py”, line 9, in tcplink
sock.send(‘Welcome!’)
TypeError: a bytes-like object is required, not ‘str’