help(QtCore) TypeError: must be str, not getset_descriptor

>>> from PySide2 import QtCore
>>> help(QtCore)
Traceback (most recent call last):
File "E:\Python36\lib\site-packages\shiboken2\files.dir\shibokensupport\signature\loader.py", line 105, in make_helptext
return errorhandler.make_helptext(func)
File "E:\Python36\lib\site-packages\shiboken2\files.dir\shibokensupport\signature\errorhandler.py", line 138, in make_helptext
msg = sigtext + "\n\n" + existing_doc if existing_doc else sigtext
TypeError: must be str, not getset_descriptor
Fatal Python error: handle_doc did not receive a result

Current thread 0x00001a04 (most recent call first):
File "E:\Python36\lib\inspect.py", line 602 in getdoc
File "E:\Python36\lib\pydoc.py", line 91 in getdoc
File "E:\Python36\lib\pydoc.py", line 1215 in docclass
File "E:\Python36\lib\pydoc.py", line 383 in document
File "E:\Python36\lib\pydoc.py", line 1165 in docmodule
File "E:\Python36\lib\pydoc.py", line 382 in document
File "E:\Python36\lib\pydoc.py", line 1636 in render_doc
File "E:\Python36\lib\pydoc.py", line 1643 in doc
File "E:\Python36\lib\pydoc.py", line 1916 in help
File "E:\Python36\lib\pydoc.py", line 1857 in _call_
File "E:\Python36\lib_sitebuiltins.py", line 103 in _call_
File "<console>", line 1 in <module>
File "E:\Python36\lib\code.py", line 91 in runcode
File "E:\Python36\lib\code.py", line 75 in runsource
File "E:\Python36\lib\code.py", line 259 in push
File "E:\dt source\36 Q\py \u6e90\u4ee3\u7801\digitser\dtbase\dtshell\base_unit.py", line 65 in run
File "E:\Python36\lib\threading.py", line 916 in _bootstrap_inner
File "E:\Python36\lib\threading.py", line 884 in _bootstrap

Thread 0x00001308 (most recent call first):
File "E:\Python36\lib\threading.py", line 1072 in _wait_for_tstate_lock
File "E:\Python36\lib\threading.py", line 1056 in join
File "E:\dt source\36 Q\py \u6e90\u4ee3\u7801\digitser\dtbase\dtshell\base_unit.py", line 30 in clientStart_Method
File "E:\dt source\36 Q\py \u6e90\u4ee3\u7801\digitser\dtbase\dtshell\base_unit.py", line 21 in _init_
File "E:\dt source\36 Q\py \u6e90\u4ee3\u7801\digitser\dtbase\dtshell\base_unit.py", line 78 in main
File "E:/dt source/36 Q/py \u6e90\u4ee3\u7801/digitser/dtbase/dtshell/base_prcs.py", line 19 in <module>