问解析协议缓冲区时，字符串字段'google.cloud.language.v1beta2.TextSpan.content‘包含无效的UTF-8数据

EN

def entities_file(gcs_uri):
"""Detects entities in the file located in Google Cloud Storage."""
client = language_v1beta2.LanguageServiceClient()

# Instantiates a plain text document.
document = types.Document(
    gcs_content_uri=gcs_uri,
    type=enums.Document.Type.PLAIN_TEXT)

# Detects sentiment in the document. You can also analyze HTML with:
#   document.type == enums.Document.Type.HTML
entities = client.analyze_entities(document).entities

# entity types from enums.Entity.Type
entity_type = ('UNKNOWN', 'PERSON', 'LOCATION', 'ORGANIZATION',
               'EVENT', 'WORK_OF_ART', 'CONSUMER_GOOD', 'OTHER')

for entity in entities:
    print('=' * 20)
    print(u'{:<16}: {}'.format('name', entity.name))
    print(u'{:<16}: {}'.format('type', entity_type[entity.type]))
    print(u'{:<16}: {}'.format('metadata', entity.metadata))
    print(u'{:<16}: {}'.format('salience', entity.salience))
    print(u'{:<16}: {}'.format('wikipedia_url',
          entity.metadata.get('wikipedia_url', '-')))

python snippets.py entities-file gs://neotokyo-cloud-bucket/TXT/TTS-01.txt

[libprotobuf ERROR google/protobuf/wire_format_lite.cc:629]. 
String field 'google.cloud.language.v1beta2.TextSpan.content' 
contains invalid UTF-8 data when parsing a protocol buffer. 
Use the 'bytes' type if you intend to send raw bytes.

 ERROR:root:Exception deserializing message!
 Traceback (most recent call last):
 File "/usr/local/lib/python2.7/dist-packages/grpc/_common.py", line 87, in _transform
return transformer(message)
 DecodeError: Error parsing message
 Traceback (most recent call last):
 File "snippets.py", line 336, in <module>
entities_file(args.gcs_uri)
 File "snippets.py", line 114, in entities_file
entities = client.analyze_entities(document).entities
 File "/usr/local/lib/python2.7/dist-     packages/google/cloud/language_v1beta2/gapic/language_service_client.py", line 226, in analyze_entities
return self._analyze_entities(request, retry=retry, timeout=timeout)
 File "/usr/local/lib/python2.7/dist-packages/google/api_core/gapic_v1/method.py", line 139, in __call__
return wrapped_func(*args, **kwargs)
 File "/usr/local/lib/python2.7/dist-packages/google/api_core/retry.py", line 260, in retry_wrapped_func
on_error=on_error,
 File "/usr/local/lib/python2.7/dist-packages/google/api_core/retry.py", line 177, in retry_target
return target()
 File "/usr/local/lib/python2.7/dist-packages/google/api_core/timeout.py", line 206, in func_with_timeout
return func(*args, **kwargs)
 File "/usr/local/lib/python2.7/dist-packages/google/api_core/grpc_helpers.py", line 56, in error_remapped_callable
six.raise_from(exceptions.from_grpc_error(exc), exc)
 File "/usr/local/lib/python2.7/dist-packages/six.py", line 737, in raise_from
raise value
 google.api_core.exceptions.InternalServerError: 500 Exception deserializing response!