[BUG] Show error when simulation fails from backend

[gr812b]

Describe the bug
Show the error message that is returned from the /stream endpoint

Ex: {"type": "error", "message": "Height -0.019049999999999997 is not within ramp range. Ramp height range: [2.42861286636753e-17, -0.02634569993665288]"}

Use Case
Users needs to see this to understand why their parameters are wrong