error:parser.parse(options.dump_file[0])

[cjhlai]

when i run rdb --command diff node10.81.194.36:6379-1608286170593782-176141.rdb | sort > dump1.txt
it return error below:
rdb --command diff 176141.rdb | sort > dump1.txt
^CTraceback (most recent call last):
File "/usr/bin/rdb", line 9, in
load_entry_point('rdbtools==0.1.15', 'console_scripts', 'rdb')()
File "/usr/lib/python2.7/site-packages/rdbtools-0.1.15-py2.7.egg/rdbtools/cli/rdb.py", line 106, in main
parser.parse(options.dump_file[0])
File "/usr/lib/python2.7/site-packages/rdbtools-0.1.15-py2.7.egg/rdbtools/parser.py", line 394, in parse
self.parse_fd(open(filename, "rb"))
File "/usr/lib/python2.7/site-packages/rdbtools-0.1.15-py2.7.egg/rdbtools/parser.py", line 461, in parse_fd
self.read_object(f, data_type)
File "/usr/lib/python2.7/site-packages/rdbtools-0.1.15-py2.7.egg/rdbtools/parser.py", line 555, in read_object
self._callback.sadd(self._key, val)
File "/usr/lib/python2.7/site-packages/rdbtools-0.1.15-py2.7.egg/rdbtools/callbacks.py", line 317, in sadd
self._out.write(self.dbstr() + self.encode_key(key) + b' { ' + self.encode_value(member) + b' }')

pls help ,tks