docker log ERR

[yinyucheng111]

Traceback (most recent call last):
File "app.py", line 121, in
REGISTRY.register(MetricsServerExporter())
File "/usr/local/lib/python3.6/site-packages/prometheus_client/core.py", line 54, in register
names = self._get_names(collector)
File "/usr/local/lib/python3.6/site-packages/prometheus_client/core.py", line 91, in _get_names
for metric in desc_func():
File "app.py", line 71, in collect
nodes = json.loads(ret['nodes'].text)
File "/usr/local/lib/python3.6/json/init.py", line 354, in loads
return _default_decoder.decode(s)
File "/usr/local/lib/python3.6/json/decoder.py", line 342, in decode
raise JSONDecodeError("Extra data", s, end)
json.decoder.JSONDecodeError: Extra data: line 1 column 5 (char 4)