WebAPP break down when I training.

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I use Mac OS, and I have installed libcurl. The WebAPP can run. But When I try to train, I get these error message. Do you know how to fix it?

W tensorflow/core/platform/cloud/google_auth_provider.cc:151] All attempts to get a Google authentication bearer token failed, returning an empty token. Retrieving token from files failed with "Failed precondition: Could not initialize the libcurl library. Please make sure that libcurl is installed in the OS or statically linked to the TensorFlow binary.". Retrieving token from GCE failed with "Failed precondition: Could not initialize the libcurl library. Please make sure that libcurl is installed in the OS or statically linked to the TensorFlow binary.".

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Logs:

2018-04-03 09:33:49,154 - candysorter.views.api - INFO - === Start training: id=9120093671565748, session=20180403_093211_9120093671565748 ===
2018-04-03 09:33:49,154 - candysorter.views.api - INFO - Creating labels file: job_id=candy_sorter_20180403_093211_9120093671565748
2018-04-03 09:33:49,184 - candysorter.views.api - ERROR - Unexpected error.
Traceback (most recent call last):
File "/Users/wubinbin/anaconda3/envs/candy/lib/python2.7/site-packages/flask/app.py", line 1612, in full_dispatch_request
rv = self.dispatch_request()
File "/Users/wubinbin/anaconda3/envs/candy/lib/python2.7/site-packages/flask/app.py", line 1598, in dispatch_request
return self.view_functionsrule.endpoint
File "/Users/wubinbin/Developer/FindYourCandy/webapp/candysorter/views/api.py", line 101, in wrapper
return f(*args, **kwargs)
File "/Users/wubinbin/Developer/FindYourCandy/webapp/candysorter/views/api.py", line 337, in train
candy_trainer.create_labels_file(job_id, labels)
File "/Users/wubinbin/Developer/FindYourCandy/webapp/candysorter/models/images/train.py", line 76, in create_labels_file
f.write(json.dumps(labels, separators=(',', ':')))
File "/Users/wubinbin/anaconda3/envs/candy/lib/python2.7/site-packages/tensorflow/python/lib/io/file_io.py", line 150, in exit
self.close()
File "/Users/wubinbin/anaconda3/envs/candy/lib/python2.7/site-packages/tensorflow/python/lib/io/file_io.py", line 182, in close
pywrap_tensorflow.Set_TF_Status_from_Status(status, ret_status)
File "/Users/wubinbin/anaconda3/envs/candy/lib/python2.7/contextlib.py", line 24, in exit
self.gen.next()
File "/Users/wubinbin/anaconda3/envs/candy/lib/python2.7/site-packages/tensorflow/python/framework/errors_impl.py", line 469, in raise_exception_on_not_ok_status
pywrap_tensorflow.TF_GetCode(status))
FailedPreconditionError: Could not initialize the libcurl library. Please make sure that libcurl is installed in the OS or statically linked to the TensorFlow binary.