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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Runtime.ExitError AttributeError: 'NoneType' object has no attribute 'next'","articleBody":"This is happening to me with the `python:3.9-alpine3.12` base image. Here is the Dockerfile:\r\n\r\n```Dockerfile\r\nARG build_info=\"head@now\"\r\nARG build_env=\"development\"\r\n\r\nFROM python:3.9-alpine3.12 AS base\r\n\r\nARG build_info\r\nARG build_env\r\n\r\nENV PYTHONPATH=/function\r\nENV BUILD_INFO=${build_info}\r\n\r\nWORKDIR /function\r\nCOPY . /function\r\n\r\nRUN apk add --no-cache --virtual .build-deps \\\r\n    autoconf \\\r\n    automake \\\r\n    build-base \\\r\n    cmake \\\r\n    libcurl \\\r\n    libexecinfo-dev \\\r\n    libstdc++ \\\r\n    libtool \\\r\n    make \\\r\n    postgresql-dev \\\r\n    python3-dev \\\r\n    \u0026\u0026 pip install --no-cache-dir -e . \\\r\n    \u0026\u0026 apk del --no-cache .build-deps\r\n\r\nFROM base AS build-production\r\nRUN echo \" -\u003e Building production image\"\r\n\r\nFROM base AS build-development\r\nRUN echo \" -\u003e Building development image\" \\\r\n    \u0026\u0026 apk add --no-cache \\\r\n    bash \\\r\n    vim \\\r\n    iputils \\\r\n    \u0026\u0026 pip3 install --no-cache-dir -e .[debug,testing]\r\n\r\nENV PS1=\"someapp\u003e \"\r\nENV PYTHONBREAKPOINT=ipdb.set_trace\r\n\r\nFROM build-${build_env} AS final\r\n\r\nADD https://github.com/aws/aws-lambda-runtime-interface-emulator/releases/latest/download/aws-lambda-rie /usr/bin/aws-lambda-rie\r\nCOPY entry.sh /\r\nRUN chmod 755 /usr/bin/aws-lambda-rie /entry.sh\r\nENTRYPOINT [ \"/entry.sh\" ]\r\nCMD [ \"fieldeye.handler\" ]\r\n```\r\n\r\nHere's the `entry.sh`: \r\n\r\n```bash\r\n#!/bin/sh\r\n\r\nif [ -z \"${AWS_LAMBDA_RUNTIME_API}\" ]; then\r\n    exec /usr/bin/aws-lambda-rie /usr/local/bin/python -m awslambdaric $1\r\nelse\r\n    exec /usr/local/bin/python -m awslambdaric $1\r\nfi\r\n```\r\n\r\nand here's the error:\r\n\r\n```\r\ntime=\"2021-02-19T00:09:20.268\" level=info msg=\"exec '/usr/local/bin/python' (cwd=/function, handler=someapp.handler)\"\r\ntime=\"2021-02-19T00:09:26.44\" level=info msg=\"extensionsDisabledByLayer(/opt/disable-extensions-jwigqn8j) -\u003e stat /opt/disable-extensions-jwigqn8j: no such file or directory\"\r\nSTART RequestId: 724c1d85-78fc-4424-800e-c745e8bd51a1 Version: $LATEST\r\ntime=\"2021-02-19T00:09:26.441\" level=warning msg=\"Cannot list external agents\" error=\"open /opt/extensions: no such file or directory\"\r\nTraceback (most recent call last):\r\n  File \"/usr/local/lib/python3.9/runpy.py\", line 197, in _run_module_as_main\r\n    return _run_code(code, main_globals, None,\r\n  File \"/usr/local/lib/python3.9/runpy.py\", line 87, in _run_code\r\n    exec(code, run_globals)\r\n  File \"/usr/local/lib/python3.9/site-packages/awslambdaric/__main__.py\", line 21, in \u003cmodule\u003e\r\n    main(sys.argv)\r\n  File \"/usr/local/lib/python3.9/site-packages/awslambdaric/__main__.py\", line 17, in main\r\n    bootstrap.run(app_root, handler, lambda_runtime_api_addr)\r\n  File \"/usr/local/lib/python3.9/site-packages/awslambdaric/bootstrap.py\", line 416, in run\r\n    event_request = lambda_runtime_client.wait_next_invocation()\r\n  File \"/usr/local/lib/python3.9/site-packages/awslambdaric/lambda_runtime_client.py\", line 76, in wait_next_invocation\r\n    response_body, headers = runtime_client.next()\r\nAttributeError: 'NoneType' object has no attribute 'next'\r\nExecuting 'someapp.handler' in function directory '/function'\r\ntime=\"2021-02-19T00:09:26.604\" level=warning msg=\"First fatal error stored in appctx: Runtime.ExitError\"\r\ntime=\"2021-02-19T00:09:26.604\" level=warning msg=\"Process 13(python) exited: Runtime exited with error: exit status 1\"\r\ntime=\"2021-02-19T00:09:26.604\" level=error msg=\"Init failed\" InvokeID= error=\"Runtime exited with error: exit status 1\"\r\ntime=\"2021-02-19T00:09:26.604\" level=warning msg=\"Failed to send default error response: ErrInvalidInvokeID\"\r\ntime=\"2021-02-19T00:09:26.604\" level=error msg=\"INIT DONE failed: Runtime.ExitError\"\r\ntime=\"2021-02-19T00:09:26.604\" level=warning msg=\"Reset initiated: ReserveFail\"\r\n\r\n```\r\n\r\nJust to make sure, I ran `docker exec -it mycontainer /bin/bash` and typed `/usr/local/bin/python --version`, the response was `Python 3.9.1`","author":{"url":"https://github.com/synic","@type":"Person","name":"synic"},"datePublished":"2021-02-19T00:12:15.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":8},"url":"https://github.com/22/aws-lambda-python-runtime-interface-client/issues/22"}