ImportError: No module named 'PyQt5.Qsci' [1016] Failed to execute script Interface

Question

I am trying build executable file for windows using PyInstaller 4 upgrade. I can build the executable file but when I am importing QsciScintilla, it doesn't work. I followed their tutorial and tried to use hidden import as well, I don't know how to fix it. I have been using Python 3.5.4 for development. Here is the error which I am getting:

"newnev\lib\site-packages\PyInstaller\loader\pyimod03_importers.py", line 621, in exec_module
    exec(bytecode, module.__dict__)
  File "Window.py", line 10, in <module>
    from PyQt5.Qsci import QsciScintilla
ImportError: No module named 'PyQt5.Qsci'
[1016] Failed to execute script Interface

have used:

pyinstaller --onefile --windowed Window.py
pyinstaller --onefile Window.py
pyinstaller --hidden-import=PyQt5.Qsci --onefile Window.py
pyinstaller --hiddenimport=PyQt5.Qsci --onefile Window.py

even with Python -m PyInstaller --onefile --windowed Window.py.

Here is the .spec file which I found using pyinstaller --onefile --windowed Interface.py

# -*- mode: python ; coding: utf-8 -*-

block_cipher = None


a = Analysis(['Interface.py'],
             pathex=['C:\\Users\\sasah\\Desktop\\Example'],
             binaries=[],
             datas=[],
             hiddenimports=[],
             hookspath=[],
             runtime_hooks=[],
             excludes=[],
             win_no_prefer_redirects=False,
             win_private_assemblies=False,
             cipher=block_cipher,
             noarchive=False)
pyz = PYZ(a.pure, a.zipped_data,
             cipher=block_cipher)
exe = EXE(pyz,
          a.scripts,
          a.binaries,
          a.zipfiles,
          a.datas,
          [],
          name='Interface',
          debug=False,
          bootloader_ignore_signals=False,
          strip=False,
          upx=True,
          upx_exclude=[],
          runtime_tmpdir=None,
          console=False )

I don't know how to bypass the issues and build the script running.