Error after pressing "let's rock!"

[Blazeolmo]

When i press "Let's rock!" i get this error
MessageError Traceback (most recent call last)
in ()
46 get_ipython().system('rm -rf /content/pulse/input/face.png')
47 clear_output()
---> 48 uploaded = files.upload()
49 for fn in uploaded.keys():
50 print('User uploaded file "{name}" with length {length} bytes'.format(

2 frames
/usr/local/lib/python3.7/dist-packages/google/colab/_message.py in read_reply_from_input(message_id, timeout_sec)
104 reply.get('colab_msg_id') == message_id):
105 if 'error' in reply:
--> 106 raise MessageError(reply['error'])
107 return reply.get('data', None)
108

MessageError: TypeError: Cannot read properties of undefined (reading '_uploadFiles')

I resetted the runtime and tried over and over again pressing the button. i always get this error. what should i do?