Build failed in GNOME Builder

[PhilippKosarev]

Am I missing a dependency or is something else misconfigured?

Logs

Emptying app dir '/home/philipp/.var/app/org.gnome.Builder/cache/gnome-builder/projects/paper-plane/flatpak/staging/x86_64-main'
Starting build of app.drey.PaperPlane.Devel
Cache hit for rlottie, skipping build
Cache hit for blueprint-compiler, skipping build

** (flatpak-builder:641): WARNING **: 14:36:23.361: Failed to get current git checksum: Failed to change to directory “/home/philipp/.var/app/org.gnome.Builder/cache/gnome-builder/flatpak-builder/git/https_gitlab.gnome.org_GNOME_gtk.git” (No such file or directory)
Cache miss, checking out last cache hit

** (flatpak-builder:641): WARNING **: 14:36:23.367: rofiles-fuse not available, doing without
========================================================================
Building module gtk in /home/philipp/.var/app/org.gnome.Builder/cache/gnome-builder/flatpak-builder/build/gtk-2
========================================================================
cp: cannot stat '/home/philipp/.var/app/org.gnome.Builder/cache/gnome-builder/flatpak-builder/git/https_gitlab.gnome.org_GNOME_gtk.git': No such file or directory
Error: module gtk: Child process exited with code 1