hp-toolbox and hp-setup fail to load

I am using debian sid and I installed hplip from the repositories. However, when I try to run hp-toolbox, I get the following error:

Traceback (most recent call last):
  File "/usr/bin/hp-setup", line 48, in <module>
    from base import device, utils, tui, models, module, services, os_utils
  File "/usr/share/hplip/base/device.py", line 41, in <module>
    from . import status
  File "/usr/share/hplip/base/status.py", line 32, in <module>
    import cupsext
ImportError: libhpipp.so.0: cannot open shared object file: No such file or directory

When I run hp-check -t I get the following:

    warning: CUPSEXT could not be loaded. Please check HPLIP installation.