Python error xml.etree.ElementTree.ParseError: no element found: line 1, column 0

I'd like to write the code as follows and save it as a text file, but what's the reason for that error? Sometimes I can, but sometimes I can't, so I have a headache.

def parsingXml(fileName):

    import xml.etree.ElementTree as et
    import sys
    import os
    import logging
    logging.basicConfig(format = "%(asctime)s, %(levelname)s: %(message)s", datefmt = "%Y-%m-%d %H:%M:%S %p", level = logging.DEBUG)


    try:
        sys.stdout = open("C:\\btobl_xml\\{}.txt".format(fileName), "w", encoding = "utf8")

    except Exception:
        logging.exception("OUT ERROR")


    try:
        targetDir = "C:\\btobl_xml"
        fileLIst = os.listdir(targetDir)
        xmlList = []

        for file in fileLIst:
            if ".xml" and fileName in file:
                xmlList.append(file)

        for xmlFile in xmlList:
            targetPath = targetDir + "\\" + xmlFile
            root = et.parse(targetPath).getroot()

            for tag1 in root:
                print("-" * 50)
                print("->", tag1.tag, ":", tag1.text)
                for tag2 in tag1:
                    print("-->", tag2.tag, ":", tag2.text, tag2.attrib)
                    for tag3 in tag2:
                        print("--->", tag3.tag, ":", tag3.text)
                        for tag4 in tag3:
                            print("---->", tag4.tag, tag4.text, tag4.attrib)


    except Exception:
        logging.exception("parsing error")

python xml

2022-09-20 15:14