How can i solve this error with my package?

Hello, I am having trouble downloading the supernova package. I keep getting this error. Please help this is due tonight and I can't figure it out.
My code:
#Alternatively, can use SUPERNOVA

My output code:

trying URL ''
Warning in install.packages :
cannot open URL '':
Warning in install.packages :
download of package ‘supernova’ failed

I'm not sure what's causing the download step of install.packages("supernova") to fail (it worked when I tried it on my system). However, you can download the package zip file directly by clicking on the package URL ( and install it from your hard drive. Place the package file in your current working directory and run install.packages("supernova_2.2.3.tgz", type="source", repos=NULL).

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