Server 500 Error Rasa nlu

Hi, I started the nlu server by typing this command in cmd:

rasa run --enable-api -m models/(name of my package).tar

and then in other cmd window typed:

curl localhost:5005/model/parse -d ‘{“text”:“hello”}’

after that I got an error:

{“version”:“1.2.3”,“status”:“failure”,“message”:“An unexpected error occurred. Error: Failed when parsing body as json”,“reason”:“ParsingError”,“details”:{},“help”:null,“code”:500}

What is the reason for it? what should I change to get the normal(200) output?

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