Updating Mac Pro from El Capitan to Sonoma

As the title says im currently trying to get a Mac Pro (early 2009) to run Sonoma with the help of this https://www.youtube.com/watch?v=D8djeFJ1czU&t=160s tutorial. Currently its still on OS X 10.11.6. Everything went great until the actual installation process. When im selecting a hard drive to install to, it keeps saying "there was an error while preparing the installation".

Any help would be greatly appreciated.

submitted by /u/Nude_Crack
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