Gooey from argument to read file - python-3.x

Question

So the first argument is the file to open and the second argument is the pattern (or text) to search for.
The program is made to scan a document and find items equal to "Pattern" and print the detector address in "DetectorPattern". I got this program working without Gooey but i thought about adding it for ease of use. My problem lies when the argument get passed to the "with open(filename)" line.
This is the error i get:
Traceback (most recent call last):
File "C:/Users/haral/Google Drive (synkroniseres ikke)/Programmering/Programmer/LogSearch/LogSearchGooey.py", line 42, in <module>
main()
File "C:\Users\haral\PycharmProjects\AutomateBoringStuff\venv\lib\site-packages\gooey\python_bindings\gooey_decorator.py", line 134, in <lambda>
return lambda *args, **kwargs: func(*args, **kwargs)
File "C:/Users/haral/Google Drive (synkroniseres ikke)/Programmering/Programmer/LogSearch/LogSearchGooey.py", line 27, in main
with open(filename, 'r') as reader:
TypeError: expected str, bytes or os.PathLike object, not Namespace
import os
import re
from gooey import Gooey, GooeyParser
pattern = ""
# Chosen search pattern
detectorPattern = re.compile(r'\d\d\.\d\d\d')
# Fire alarm detector pattern, etc. 03.040
filename = ""
foundDetector = []
#Gooey
def main():
parser = GooeyParser(description="Testing")
parser.add_argument(
"Filename",
help="Choose a file",
widget="FileChooser"
)
parser.add_argument(
"store",
help="Choose a pattern to search for"
)
filename = parser.parse_args()
with open(filename, 'r') as reader:
# Read and print the entire file line by line
for line in reader:
findLine = re.search(pattern, line)
if findLine is not None:
mo = detectorPattern.search(findLine.string)
mog = mo.group()
if mog not in foundDetector:
foundDetector.append(mog)
for x in foundDetector:
print(x)
if __name__ == '__main__':
main()