pygrun is wrong

[Grit-he]

when i run pygrun Hello r --tokens input.txt
Traceback (most recent call last):
File "/home/hehongbin/桌面/py3antlr4book-master/bin/pygrun", line 178, in
module_lexer = import(lexerName, globals(), locals(), lexerName)
File "/home/hehongbin/.local/lib/python3.8/site-packages/shiboken2/files.dir/shibokensupport/feature.py", line 142, in _import
return original_import(name, *args, **kwargs)
File "/home/hehongbin/桌面/py3antlr4book-master/01-Hello/./HelloLexer.py", line 25, in
class HelloLexer(Lexer):
File "/home/hehongbin/桌面/py3antlr4book-master/01-Hello/./HelloLexer.py", line 27, in HelloLexer
atn = ATNDeserializer().deserialize(serializedATN())
File "/usr/local/lib/python3.8/dist-packages/antlr4/atn/ATNDeserializer.py", line 28, in deserialize
self.checkVersion()
File "/usr/local/lib/python3.8/dist-packages/antlr4/atn/ATNDeserializer.py", line 50, in checkVersion
raise Exception("Could not deserialize ATN with version " + str(version) + " (expected " + str(SERIALIZED_VERSION) + ").")
Exception: Could not deserialize ATN with version (expected 4).
this question arises, how can i solve this question?thanks

[t0hka1]

Try to run this command and your problem will be solve!
pip install antlr4-python3-runtime==4.7.2