Corrected causal simultation

1 job for master in 1 minute and 11 seconds
Status Job ID Name Coverage
  Test
failed #21767
pages

00:01:11

 
Name Stage Failure
failed
pages Test There is an unknown failure, please try again
Creating file ./source/_autosummary/raiss.rst.
Creating file ./source/_autosummary/modules.rst.
$ make html
Running Sphinx v1.8.5

Extension error:
Could not import extension nbsphinx (exception: No module named 'nbsphinx')
make: *** [html] Error 2
ERROR: Job failed: exit code 1