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TypeError: 'bool' object is not callable

See original GitHub issue

Description

What steps will reproduce the problem?

During startup, Spyder4 (‘mainwindow.py’) reports a type error where mod.PLUGIN_CLASS(self) appears to be calling a bool-type object.

Traceback

  File "c:\program files\python\lib\site-packages\spyder\app\mainwindow.py", line 985, in setup
    plugin = mod.PLUGIN_CLASS(self)
TypeError: 'bool' object is not callable

Versions

Spyder version: 4.1.0
Python version: 3.8.0
Qt version: 5.12.6
PyQt5 version: 5.12.3
Operating System: Windows 10

Dependencies


# Mandatory:
atomicwrites >=1.2.0           :  1.3.0 (OK)
chardet >=2.0.0                :  3.0.4 (OK)
cloudpickle >=0.5.0            :  1.2.2 (OK)
diff_match_patch >=20181111    :  20181111 (OK)
intervaltree                   :  None (OK)
IPython >=4.0                  :  7.10.1 (OK)
jedi =0.14.1                   :  0.14.1 (OK)
nbconvert >=4.0                :  5.6.1 (OK)
numpydoc >=0.6.0               :  0.9.1 (OK)
paramiko >=2.4.0               :  2.7.0 (OK)
parso =0.5.2                   :  0.5.2 (OK)
pexpect >=4.4.0                :  4.7.0 (OK)
pickleshare >=0.4              :  0.7.5 (OK)
psutil >=5.3                   :  5.6.7 (OK)
pygments >=2.0                 :  2.5.2 (OK)
pylint >=0.25                  :  2.4.4 (OK)
pyls >=0.31.2;<0.32.0          :  0.31.2 (OK)
qdarkstyle >=2.8               :  2.8 (OK)
qtawesome >=0.5.7              :  0.6.0 (OK)
qtconsole >=4.6.0              :  4.6.0 (OK)
qtpy >=1.5.0                   :  1.9.0 (OK)
sphinx >=0.6.6                 :  2.2.2 (OK)
spyder_kernels >=1.9.0;<1.10.0 :  1.9.0 (OK)
watchdog                       :  None (OK)
zmq >=17                       :  18.1.1 (OK)

# Optional:
cython >=0.21                  :  0.29.15 (OK)
matplotlib >=2.0.0             :  3.2.0 (OK)
numpy >=1.7                    :  1.18.2 (OK)
pandas >=0.13.1                :  1.0.2 (OK)
scipy >=0.17.0                 :  1.4.1 (OK)
sympy >=0.7.3                  :  1.5.1 (OK)