[Python] Getting IOError: [Errno 21] Is a directory error when trying to run PyInstaller

I'm trying to create an executable file for my Python script using PyInstaller. I run in the terminal:

pyinstaller --onefile --windowed ./lab_attendant_emailer.py


From the directory that the python file is in. It starts running for a bit but returns this error.

12 INFO: PyInstaller: 3.1.1
12 INFO: Python: 2.7.6
12 INFO: Platform: Linux-3.16.0-67-generic-x86_64-with-Ubuntu-14.04-trusty
12 INFO: wrote /home/carsnwd/PycharmProjects/labattendantemailer/lab_attendant_emailer.spec
14 INFO: UPX is not available.
15 INFO: Extending PYTHONPATH with paths
['/home/carsnwd/PycharmProjects/labattendantemailer',
'/home/carsnwd/PycharmProjects/labattendantemailer']
15 INFO: checking Analysis
21 INFO: checking PYZ
22 INFO: checking PKG
25 INFO: Bootloader /usr/local/lib/python2.7/dist-packages/PyInstaller/bootloader/Linux-64bit/run
25 INFO: checking EXE
25 INFO: Building because name changed
25 INFO: Building EXE from out00-EXE.toc
Traceback (most recent call last):
File "/usr/local/bin/pyinstaller", line 9, in <module>
load_entry_point('PyInstaller==3.1.1', 'console_scripts', 'pyinstaller')()
File "/usr/local/lib/python2.7/dist-packages/PyInstaller/__main__.py", line 90, in run
run_build(pyi_config, spec_file, **vars(args))
File "/usr/local/lib/python2.7/dist-packages/PyInstaller/__main__.py", line 46, in run_build
PyInstaller.building.build_main.main(pyi_config, spec_file, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/PyInstaller/building/build_main.py", line 755, in main
build(specfile, kw.get('distpath'), kw.get('workpath'), kw.get('clean_build'))
File "/usr/local/lib/python2.7/dist-packages/PyInstaller/building/build_main.py", line 701, in build
exec(text, spec_namespace)
File "<string>", line 28, in <module>
File "/usr/local/lib/python2.7/dist-packages/PyInstaller/building/api.py", line 498, in __init__
self.__postinit__()
File "/usr/local/lib/python2.7/dist-packages/PyInstaller/building/datastruct.py", line 183, in __postinit__
self.assemble()
File "/usr/local/lib/python2.7/dist-packages/PyInstaller/building/api.py", line 575, in assemble
outf = open(self.name, 'wb')
IOError: [Errno 21] Is a directory: '/home/carsnwd/PycharmProjects/labattendantemailer/dist/lab_attendant_emailer'


What am I doing wrong?

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