Scapy_Exception: Not a supported capture file on Python3 - networking

Question

I am trying to build a python script for wifi network monitoring.
I followed this repository, which works fine if I use Python2. But if I try to convert this code to Python3 and run I get this error:
File "/Users/ecp/PycharmProjects/pythonProject4/venv/lib/python3.9/site-packages/scapy/utils.py", line 1172, in __call__
raise Scapy_Exception("Not a supported capture file")
scapy.error.Scapy_Exception: Not a supported capture file
This is the part of the code where I get the error:
class MACCollector(object):
def __init__(self, channels, bssids, interface):
self.clients = set()
self.bssids = bssids
self.channels = cycle(channels)
self.interface = interface
self.fifo = os.path.join(os.path.dirname(__file__), "pcapfifo.cap")
if not os.path.exists(self.fifo):
os.mkfifo(self.fifo)
def start(self):
subprocess.check_call([AIRPORT, "--disassociate"])
self.hop_channel()
subprocess.Popen([TCPDUMP, "-I", "-n", "-i", self.interface, "-w", self.fifo])
print(("************",self.fifo))
pcap = scapy.PcapReader(self.fifo) #HERE SCAPY CANT READ
for packet in pcap:
self.process_packet(packet)
Scapy cant read the fifo file if I use Python3.
My operating system: macOS Monterey 12.6
My Python3 version: 3.10.8
I have tried many different things, but none of it worked. I tried different ways to create the fifo file, but no luck.