Hi,

Michael Mausler <michaelmausler@gmail.com> skribis:

>   1. &store-protocol-error:
>       message: "some substitutes for the outputs of derivation
> `/gnu/store/c8bnwlki4wa6s8rz4ynbcr95imhx3s13-graphviz-2.42.3.drv' failed
> (usually happens due to networking issues); try `--fallback' to build
> derivation from source "
>       status: 1

This suggests that Guix failed to download binaries (“substitutes”) for
the GraphViz package, perhaps because of some transient networking
error.

Could you try running ‘guix pull’ again?

Thanks for your message,
Ludo’.