XiaotianZha

[BUG] <The backend Role of the internal user is not working>

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### Describe the bug I have create a new user in internal user and set an existing backend Role. But when I test this new user with fluentBit, I got...

get some error in example/rl_order_execution

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## ❓ Questions and Help We sincerely suggest you to carefully read the [documentation](http://qlib.readthedocs.io/) of our library as well as the official [paper](https://arxiv.org/abs/2009.11189). After that, if you still feel puzzled,...