IndexError: list index out of range【please help me】

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I need to solve the problem, can someone please help me.

IndexError Traceback (most recent call last)
in <cell line: 45>()
65 time.sleep(4)
66 with open('/content/srv.txt', "r") as file: text = file.read()
---> 67 srv= re.findall(r"https?://(?:\S+?.)?trycloudflare.com\S*", text)[0]
68
69 for line in fileinput.input('/usr/local/lib/python3.10/dist-packages/gradio/blocks.py', inplace=True):

IndexError: list index out of range

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