runtime error

Exit code: 1. Reason: /home/user/app/app.py:12: LineBotSdkDeprecatedIn30: Call to deprecated class LineBotApi. (Use v3 class; linebot.v3.<feature>. See https://github.com/line/line-bot-sdk-python/blob/master/README.rst for more details.) -- Deprecated since version 3.0.0. line_bot_api = LineBotApi(LINE_CHANNEL_ACCESS_TOKEN) Traceback (most recent call last): File "/home/user/app/app.py", line 12, in <module> line_bot_api = LineBotApi(LINE_CHANNEL_ACCESS_TOKEN) File "/usr/local/lib/python3.10/site-packages/linebot/api.py", line 76, in __init__ 'Authorization': 'Bearer ' + channel_access_token, TypeError: can only concatenate str (not "NoneType") to str

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