Try to run quickstart.

1 job for master in 4 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test
failed pages #13891
sphinx

00:00:04

 
Name Stage Failure
failed
pages Test

Selected root path: .

You have two options for placing the build directory for Sphinx output.
Either, you use a directory "_build" within the root path, or you separate
"source" and "build" directories within the root path.
> Separate source and build directories (y/n) [n]:
[Interrupted.]
ERROR: Job failed: exit code 130