Error message when I want to run tests after installing LASIF

[Jncheer]

HI~ Here are three errors showing up when I run 'py.test':
localhost.localdomain.4200hfi_wait_for_device: The /dev/hfi1_0 device failed to appear after 15.0 seconds: Connection timed out
============================= test session starts ==============================
platform linux2 -- Python 2.7.15, pytest-4.1.0, py-1.7.0, pluggy-0.8.0
rootdir: /home/zyj/LASIF, inifile: pytest.ini
collected 197 items / 3 errors

==================================== ERRORS ====================================
_____________ ERROR collecting lasif/ses3d_model_gui/model_gui.py ______________
lasif/ses3d_model_gui/model_gui.py:17: in
from PyQt4 import QtGui
E ImportError: No module named PyQt4
__________ ERROR collecting lasif/ses3d_model_gui/ses3d_model_gui.py ___________
lasif/ses3d_model_gui/ses3d_model_gui.py:9: in
from PyQt4 import QtCore, QtGui
E ImportError: No module named PyQt4
________________ ERROR collecting lasif/webinterface/server.py _________________
lasif/webinterface/server.py:4: in
from flask.ext.cache import Cache
E ImportError: No module named ext.cache
!!!!!!!!!!!!!!!!!!! Interrupted: 3 errors during collection !!!!!!!!!!!!!!!!!!!!
=========================== 3 error in 3.57 seconds ============================