Pyinstaller on windows 10 cant find sub packages/modules - python-3.x

Question

My project is structured as follows and I am having issues in using pyinstaller on windows 10 to build.
I am using python 3.7.3 and pyinstaller 3.4. PyQt5 version is 5.12.1
Pyinstaller builds properly with following command:
pyinstaller --clean -F calcrun.spec
However, it fails when I run calcrun.exe in dist/
#calcrun.py
import sys
from CalcApp import runner
from PyQt5 import QtWidgets
if __name__ == '__main__':
app = QtWidgets.QApplication(sys.argv)
application = runner.MyWindow()
sys.exit(app.exec())
Below is the error I get where it seems like its not able to see any module or sub package
C:\Users\Kiki\projects\learn_app\dist\calcrun>calcrun
Traceback (most recent call last):
File "learn_app\calcrun.py", line 2, in <module>
ModuleNotFoundError: No module named 'CalcApp'
[13160] Failed to execute script calcrun
I am also attaching here my calcrun.spec
# -*- mode: python -*-
block_cipher = None
a = Analysis(["calcrun.py"],
pathex=["C:\\Users\\Kiki\\projects\\learn_app"],
binaries=[],
datas=[],
hiddenimports=['pyqt5', 'pyqt5-sip'],
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,
[],
exclude_binaries=True,
name='calcrun',
debug=False,
bootloader_ignore_signals=False,
strip=False,
upx=True,
console=True )
coll = COLLECT(exe,
a.binaries,
a.zipfiles,
a.datas,
strip=False,
upx=True,
name='calcrun')