>>Error Msg
2020-06-15T08:15:55.749934+00:00 heroku[web.1]: Error R10 (Boot timeout) -> Web process failed to bind to $PORT within 60 seconds of launch
2020-06-15T08:15:55.774673+00:00 heroku[web.1]: Stopping process with SIGKILL
2020-06-15T08:15:55.965467+00:00 heroku[web.1]: Process exited with status 137
2020-06-15T08:15:56.014838+00:00 heroku[web.1]: State changed from starting to crashed
2020-06-15T08:21:47.789649+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/" host=sg-rain.herokuapp.com request_id=41c0416d-68f7-4a64-a7d7-f579e38d41de fwd="49.245.94.73" dyno= connect= service= status=503 bytes= protocol=https
2020-06-15T08:21:48.454883+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/favicon.ico" host=sg-rain.herokuapp.com request_id=27a2e194-0e07-49ee-9ce5-57da927970a1 fwd="49.245.94.73" dyno= connect= service= status=503 bytes= protocol=https
2020-06-15T08:25:30.735835+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/" host=sg-rain.herokuapp.com request_id=9d69d88e-c73c-4acb-8b95-44abb8f21a16 fwd="49.245.94.73" dyno= connect= service= status=503 bytes= protocol=https
2020-06-15T08:25:31.700410+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/favicon.ico" host=sg-rain.herokuapp.com request_id=d4066757-491a-4fac-9e92-e18810432299 fwd="49.245.94.73" dyno= connect= service= status=503 bytes= protocol=https

>>Docker File
FROM python:3.7

# streamlit-specific commands
RUN mkdir -p /root/.streamlit
RUN bash -c 'echo -e "\
[general]\n\
email = \"\"\n\
" > /root/.streamlit/credentials.toml'
RUN bash -c 'echo -e "\
[server]\n\
enableCORS = false\n\
port = $PORT\n\
" > /root/.streamlit/config.toml'

EXPOSE 8501

WORKDIR /app

COPY requirements.txt ./requirements.txt

RUN apt update && apt -y install build-essential

RUN pip install -r requirements.txt

RUN pip install convertdate

RUN pip install LunarCalendar

RUN pip install holidays

RUN pip install pystan==2.19

RUN pip install fbprophet==0.6

COPY . .

CMD streamlit run app.py

>>Procfile
web: streamlit run app.py

>>requirements.txt
pandas
numpy
streamlit
plotly
chart_studio