When copying files in the directory, an error appears that the path to the directory or the file itself does not exist

The program should copy all files from the current directory and all subdirectories.

At startup, the program worked and copied 42 of 299 files and issued the following error:

--------------------------------------------------------------------------- FileNotFoundError Traceback (most recent call last) <ipython-input-2-40d66524ed3e> in <module>() ----> 1 copy_files(r'C:\Users\Dmytro\Desktop\map') <ipython-input-1-fbaa373faa32> in copy_files(folder) 7 for currentFolder, subFolders, fileNames in os.walk(folder): 8 for i in fileNames: ----> 9 shutil.copy(currentFolder+'\\'+i, r'C:\Users\Dmytro\Desktop\Folder') ~\Anaconda3\lib\shutil.py in copy(src, dst, follow_symlinks) 239 if os.path.isdir(dst): 240 dst = os.path.join(dst, os.path.basename(src)) --> 241 copyfile(src, dst, follow_symlinks=follow_symlinks) 242 copymode(src, dst, follow_symlinks=follow_symlinks) 243 return dst ~\Anaconda3\lib\shutil.py in copyfile(src, dst, follow_symlinks) 118 os.symlink(os.readlink(src), dst) 119 else: --> 120 with open(src, 'rb') as fsrc: 121 with open(dst, 'wb') as fdst: 122 copyfileobj(fsrc, fdst) FileNotFoundError: [Errno 2] No such file or directory: 'C:\\Users\\Dmytro\\Desktop\\map\\LOFT APARTMENT -share by QKK\\qwe]\\LOFT APARTMENT LIVINGROOM-by QKK\\map\\30.5.17\\30.05.17\\SCAN CRN sua\\chua loc 1.9\\New folder (6)\\New folder\\20150702_Livingroom_Corona_4pixosGIFTscene\\20150120 Interior Design\\MAX\\MAP\\GlassEtchings.jpg' 

Although the file itself and the directory exist, otherwise the walk module has learned about them.

I decided to make a check on the existence of the directory and the file and about the miracle before copying, the program worked without errors, but copied 255/299 files, how so and why some directories and files do not see?

The program itself:

 import shutil import os def copy_files(folder): '''Copy all files in current Folder and sub Folder''' for currentFolder, subFolders, fileNames in os.walk(folder): for i in fileNames: if os.path.isdir(currentFolder) and os.path.isfile(currentFolder+'\\'+i): shutil.copy(currentFolder+'\\'+i, r'C:\Users\Dmytro\Desktop\Folder')