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rqt not working

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Hi everyone, I am following tutorial of ROS. When I tried this command "rqt_plot /turtle1/pose/x:y:z", it shows errors like below. What is wrong? Traceback (most recent call last): File "/opt/ros/kinetic/bin/rqt_plot", line 6, in from rqt_plot.plot import Plot File "/opt/ros/kinetic/lib/python2.7/dist-packages/rqt_plot/plot.py", line 35, in from python_qt_binding import QT_BINDING File "/opt/ros/kinetic/lib/python2.7/dist-packages/python_qt_binding/__init__.py", line 55, in from .binding_helper import loadUi, QT_BINDING, QT_BINDING_MODULES, QT_BINDING_VERSION # @UnusedImport File "/opt/ros/kinetic/lib/python2.7/dist-packages/python_qt_binding/binding_helper.py", line 252, in getattr(sys, 'SELECT_QT_BINDING_ORDER', None), File "/opt/ros/kinetic/lib/python2.7/dist-packages/python_qt_binding/binding_helper.py", line 98, in _select_qt_binding raise ImportError("Could not find Qt binding (looked for: %s):\n%s" % (', '.join(["'%s'" % b for b in binding_order]), '\n'.join(error_msgs))) ImportError: Could not find Qt binding (looked for: 'pyqt', 'pyside'): ImportError for 'pyqt': /usr/lib/python2.7/dist-packages/PyQt5/QtCore.x86_64-linux-gnu.so: undefined symbol: _ZTI13QFileSelector Traceback (most recent call last): File "/opt/ros/kinetic/lib/python2.7/dist-packages/python_qt_binding/binding_helper.py", line 89, in _select_qt_binding QT_BINDING_VERSION = binding_loader(required_modules, optional_modules) File "/opt/ros/kinetic/lib/python2.7/dist-packages/python_qt_binding/binding_helper.py", line 131, in _load_pyqt _named_import('PyQt5.%s' % module_name) File "/opt/ros/kinetic/lib/python2.7/dist-packages/python_qt_binding/binding_helper.py", line 111, in _named_import module = builtins.__import__(name) ImportError: /usr/lib/python2.7/dist-packages/PyQt5/QtCore.x86_64-linux-gnu.so: undefined symbol: _ZTI13QFileSelector ImportError for 'pyside': /usr/lib/x86_64-linux-gnu/libQt5Network.so.5: undefined symbol: _ZN16QLoggingCategoryD1Ev Traceback (most recent call last): File "/opt/ros/kinetic/lib/python2.7/dist-packages/python_qt_binding/binding_helper.py", line 89, in _select_qt_binding QT_BINDING_VERSION = binding_loader(required_modules, optional_modules) File "/opt/ros/kinetic/lib/python2.7/dist-packages/python_qt_binding/binding_helper.py", line 163, in _load_pyside _named_import('PySide2.%s' % module_name) File "/opt/ros/kinetic/lib/python2.7/dist-packages/python_qt_binding/binding_helper.py", line 111, in _named_import module = builtins.__import__(name) ImportError: /usr/lib/x86_64-linux-gnu/libQt5Network.so.5: undefined symbol: _ZN16QLoggingCategoryD1Ev

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