I don't know. The program was pretty unstable when I first began to use it and installed each of the components separately. I found where someone had put together a complete package that included all of the necessary parts in a single install and mine system has worked really well since.

The program installs Python and is called SpleeterGUI and doesn't take long to install.

If you installed the program another way, you may want to try this one:
https://makenweb.com/SpleeterGUI

Hope that helps.
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BIAB Ultra Pak+ 2021:RB 2021, Latest builds: Dell Optiplex 7040 Desktop; Windows-10-64 bit, Intel Core i7-6700 3.4GHz CPU and 16 GB Ram Memory.