怎么这也能解码错误?到底什么情况！

File "/.../compare_system.py", line 18, in
old = t1.readlines()
File "....Python.framework/Versions/3.9/lib/python3.9/codecs.py", line 322, in decode
(result, consumed) = self._buffer_decode(data, self.errors, final)

import csv
import os
filePath = '/...ana/'
name = os.listdir(filePath)
print(name)
dirr = []
for i in name[1:]:
    dirr.append(filePath+i)

print(dirr)

for i in dirr:
    a=os.listdir(i)
    if len(a)>=2:
        true = i+'/'+a[0]
        truee = i+'/'+a[1]
        with open(true,"r")as t1, open(truee,"r")as t2:
            old = t1.readlines()
            new = t2.readlines()
            con = []
            for line in new:
                if line not in old:
                    con.append([i,line])
            print(con)

    else:
        print(f"{i} file has less than 2 files")
exit()