Based on the errors that you get as per attached photo, it seems like you missed out a couple of instruction required to convert the model such as:
python mo_tf.py -m frozen_inference_graph.pb --tensorflow_use_custom_operations_config ssd_v2_support.json --tensorflow_object_detection_api pipeline.config
This is the complete instruction to convert.
You can refer to this video for the complete and step by step instructions: https://www.youtube.com/watch?v=cbdS3BjjbaQ
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