ValueError: No variables to save

[Santhosh S]

using default config and model, while training:
Traceback (most recent call last):
File "object_detection/train.py", line 198, in
tf.app.run()
File "/usr/local/lib/python3.5/dist-packages/tensorflow/python/platform/app.py", line 124, in run
_sys.exit(main(argv))
File "object_detection/train.py", line 194, in main
worker_job_name, is_chief, FLAGS.train_dir)
File "/home/santhosh/Documentsmns/object_detection/trainer.py", line 219, in train
init_saver = tf.train.Saver(available_var_map)
File "/usr/local/lib/python3.5/dist-packages/tensorflow/python/training/saver.py", line 1239, in init
self.build()
File "/usr/local/lib/python3.5/dist-packages/tensorflow/python/training/saver.py", line 1248, in build
self._build(self._filename, build_save=True, build_restore=True)
File "/usr/local/lib/python3.5/dist-packages/tensorflow/python/training/saver.py", line 1272, in _build
raise ValueError("No variables to save")