rasa: dialogflow migration error

Rasa NLU version: 0.13.7 Operating system (windows, osx, …): linux ubuntu 16.04 Content of model configuration file: my source code

Issue: When i try training rasa_nlu with data exported from dialogflow, i get the following error message.

....
2018-11-01 20:46:38 WARNING  rasa_nlu.training_data.formats.dialogflow  - No training examples found for dialogflow file data/dialogflow/support/intents/support.contacts.phone.json!
2018-11-01 20:46:38 INFO     rasa_nlu.training_data.training_data  - Training data stats: 
	- intent examples: 0 (0 distinct intents)
	- Found intents: 
	- entity examples: 0 (0 distinct entities)
	- found entities: 

2018-11-01 20:46:38 INFO     rasa_nlu.training_data.loading  - Training data format of data/dialogflow/support/intents/support.contacts.social_media_usersays_en.json is dialogflow_intent_examples
2018-11-01 20:46:38 INFO     rasa_nlu.training_data.training_data  - Training data stats: 
	- intent examples: 0 (0 distinct intents)
	- Found intents: 
	- entity examples: 0 (0 distinct entities)
	- found entities: 

2018-11-01 20:46:38 INFO     rasa_nlu.model  - Starting to train component tokenizer_whitespace
2018-11-01 20:46:38 INFO     rasa_nlu.model  - Finished training component.
2018-11-01 20:46:38 INFO     rasa_nlu.model  - Starting to train component ner_crf
2018-11-01 20:46:38 INFO     rasa_nlu.model  - Finished training component.
2018-11-01 20:46:38 INFO     rasa_nlu.model  - Starting to train component ner_synonyms
2018-11-01 20:46:38 INFO     rasa_nlu.model  - Finished training component.
2018-11-01 20:46:38 INFO     rasa_nlu.model  - Starting to train component intent_featurizer_count_vectors
2018-11-01 20:46:38 INFO     rasa_nlu.model  - Finished training component.
2018-11-01 20:46:38 INFO     rasa_nlu.model  - Starting to train component intent_classifier_tensorflow_embedding
2018-11-01 20:46:38 ERROR    rasa_nlu.classifiers.embedding_intent_classifier  - Can not train an intent classifier. Need at least 2 different classes. Skipping training of intent classifier.
2018-11-01 20:46:38 INFO     rasa_nlu.model  - Finished training component.
2018-11-01 20:46:38 INFO     rasa_nlu.model  - Successfully saved model into '/home/rok/project/rasa/rasa_nlu/models/dialogflow_support/model_20181101-204638'
2018-11-01 20:46:38 INFO     __main__  - Finished training

rasa_nlu did not recognize any classes, but none of them.