Issue with docker file

Hi ,

I am new to docker. I am getting this error when i try to build with dockerfile.Please suggest and help me.

docker build -t corpweb .
Sending build context to Docker daemon 30.98MB
Error response from daemon: unexpected error reading Dockerfile: read /mnt/sda1/var/lib/docker/tmp/docker-builder154749283/Dockerfile: is a directory

This is my docker file

#Executing phyton script

FROM ubuntu

MAINTAINER Depu

RUN apt-get update

RUN apt-get-install -y python python-pip

RUN pip install --upgrade pip

ADD Hellow.py /home/Hellow.py

WORKDIR /home

CMD python Hellow.py