Error commiting an image in docker

I am learning docker and while I was trying to commit my image I get this error

docker commit ccaa6f1933e Serret/FirstApp:1.0
invalid reference format

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    It’s seem to be that for consistency docker does not allow the capitalization of the names of the images

    docker commit ccaa6f1933e serret/firstapp:1.0
    

    when I did this it work perfectly

    Docker will be the best open platform for developers and sysadmins to build, ship, and run distributed applications.