human
Solve the following python programming problem given the following code:
def copy_tree(self, infile, outfile, preserve_mode = 1, preserve_times = 1, preserve_symlinks = 0, level = 1) : 
    assert (preserve_mode and preserve_times and (not preserve_symlinks)) 
    exclude = self.get_exclusions () 
    if (not exclude) : 
        return orig.install_lib.copy_tree (preserve_mode, infile, outfile) 
from setuptools.archive_util import unpack_directory 
    from distutils import log 
    outfiles = [] 
    def pf(src, dst) : 
        if (dst in exclude) : 
            log.warn ('Skipping installation of %s (namespace package)', dst) 
            return False 
log.info ('copying %s -> %s', src, os.path.dirname (dst)) 
        outfiles.append (dst) 
        return dst 
unpack_directory (infile, outfile, pf) 
    return outfiles 

    
    

    Fix the buggy line: return orig.install_lib.copy_tree (preserve_mode, infile, outfile)
assistant
#Here is Python code to fix the buggy line: return orig.

return orig.install_lib.copy_tree (self, infile, outfile)