I want to create a docker container from a Dockerfile. Here are the contents of the Dockerfile: 'FROM python:3.8

COPY requirements.txt requirements.txt
RUN python -m pip install && pip install -r requirements.txt

WORKDIR /app

COPY tg_bot.py tg_bot.py

ENTRYPOINT ["python3", "tg_bot.py"]'. However when I run 'docker build -t tg_bot_files .' I receive the following error: '#0 3.584 ERROR: You must give at least one requirement to install (see "pip help install")'. What am I doing wrong?