ros2-eloquent cannot run rqt_graph for the error "RosPluginProvider._parse_plugin_xml() plugin file "E:\dev\ros2-eloquent\ros2-windows\share\qt_gui_cpp/plugin.xml" in package?

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Hi guys,
I am using ros2-eloquent on Windows 10. When I try running rqt_graph, an error appeared like:

C:\Windows\System32>rqt_graph
RosPluginProvider._parse_plugin_xml() plugin file "E:\dev\ros2-eloquent\ros2-windows\share\qt_gui_cpp/plugin.xml" in package "qt_gui_cpp" not found
RosPluginProvider._parse_plugin_xml() plugin file "E:\dev\ros2-eloquent\ros2-windows\share\rqt_gui_cpp/plugin.xml" in package "rqt_gui_cpp" not found
RosPluginProvider._parse_plugin_xml() plugin file "E:\dev\ros2-eloquent\ros2-windows\share\qt_gui_cpp/plugin.xml" in package "qt_gui_cpp" not found
RosPluginProvider._parse_plugin_xml() plugin file "E:\dev\ros2-eloquent\ros2-windows\share\rqt_gui_cpp/plugin.xml" in package "rqt_gui_cpp" not found
Traceback (most recent call last):
File "c:\python37\lib\site-packages\pydot.py", line 1915, in create working_dir=tmp_dir,
File "c:\python37\lib\site-packages\pydot.py", line 136, in call_graphviz **kwargs
File "c:\python37\lib\subprocess.py", line 800, in __init__ restore_signals, start_new_session)
File "c:\python37\lib\subprocess.py", line 1207, in _execute_child startupinfo)
FileNotFoundError: [WinError 2] 系统找不到指定的文件。

And I don't know how to solve this problem. Any idea or answer will be appreciated!