[Python] AttributeError: module 'builtins' has no attribute 'interpreter'

It is a basic question, I guess. I can run my program in Pycharm 2018.1 Python 3.6.5. But when I run in debug mode and open python console, I get this error message when I try to key in any python command.

I am using virtualenv and added interpreter in project setting.

I wonder what's wrong with my configuration

below is stacktrace

Traceback (most recent call last):
File "/Applications/PyCharm CE.app/Contents/helpers/pydev/pydevconsole.py", line 362, in get_interpreter
interpreterInterface = getattr(__builtin__, 'interpreter')
AttributeError: module 'builtins' has no attribute 'interpreter'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/Applications/PyCharm CE.app/Contents/helpers/pydev/_pydevd_bundle/pydevd_comm.py", line 1443, in do_it
result = pydevconsole.console_exec(self.thread_id, self.frame_id, self.expression, dbg)
File "/Applications/PyCharm CE.app/Contents/helpers/pydev/pydevconsole.py", line 467, in console_exec
need_more = exec_code(CodeFragment(expression), updated_globals, frame.f_locals, dbg)
File "/Applications/PyCharm CE.app/Contents/helpers/pydev/pydevconsole.py", line 383, in exec_code
interpreterInterface = get_interpreter()
File "/Applications/PyCharm CE.app/Contents/helpers/pydev/pydevconsole.py", line 364, in get_interpreter
interpreterInterface = InterpreterInterface(None, None, threading.currentThread())
File "/Applications/PyCharm CE.app/Contents/helpers/pydev/_pydev_bundle/pydev_ipython_console.py", line 24, in __init__
self.interpreter = get_pydev_frontend(host, client_port)
File "/Applications/PyCharm CE.app/Contents/helpers/pydev/_pydev_bundle/pydev_ipython_console_011.py", line 461, in get_pydev_frontend
_PyDevFrontEndContainer._instance = _PyDevFrontEnd()
File "/Applications/PyCharm CE.app/Contents/helpers/pydev/_pydev_bundle/pydev_ipython_console_011.py", line 310, in __init__
self.ipython = PyDevTerminalInteractiveShell.instance()
File "/Users/hobart/envs/pys/lib/python3.6/site-packages/traitlets/config/configurable.py", line 412, in instance
inst = cls(*args, **kwargs)
File "/Users/hobart/envs/pys/lib/python3.6/site-packages/IPython/terminal/interactiveshell.py", line 430, in __init__
super(TerminalInteractiveShell, self).__init__(*args, **kwargs)
File "/Users/hobart/envs/pys/lib/python3.6/site-packages/IPython/core/interactiveshell.py", line 516, in __init__
self.init_completer()
File "/Applications/PyCharm CE.app/Contents/helpers/pydev/_pydev_bundle/pydev_ipython_console_011.py", line 234, in init_completer
self.Completer = self._new_completer_500()
File "/Applications/PyCharm CE.app/Contents/helpers/pydev/_pydev_bundle/pydev_ipython_console_011.py", line 196, in _new_completer_500
parent=self
File "/Applications/PyCharm CE.app/Contents/helpers/pydev/_pydev_bundle/pydev_ipython_console_011.py", line 87, in __init__
self.matchers.remove(self.python_matches)
ValueError: list.remove(x): x not in list

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