# Error running Isaac Sim hello world example

**URL:** <https://forums.developer.nvidia.com/t/error-running-isaac-sim-hello-world-example/241181>\
**Category:** Isaac Sim\
**Tags:** python\
**Created:** [January 31, 2023, 6:30pm UTC](https://forums.developer.nvidia.com/t/error-running-isaac-sim-hello-world-example/241181 "2023-01-31T18:30:22Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![mona.jalal](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/mona.jalal/32/243872_2.png) [@mona.jalal](https://forums.developer.nvidia.com/u/mona.jalal)\
**Post date:** [January 31, 2023, 6:30pm UTC](https://forums.developer.nvidia.com/t/error-running-isaac-sim-hello-world-example/241181/1 "2023-01-31T18:30:22Z")

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I am running the example in this link [1. Hello World — Omniverse Robotics documentation](https://docs.omniverse.nvidia.com/app_isaacsim/app_isaacsim/tutorial_core_hello_world.html)

```auto
#launch Isaac Sim before any other imports
#default first two lines in any standalone application
from omni.isaac.kit import SimulationApp
simulation_app = SimulationApp({"headless": False}) # we can also run as headless.

from omni.isaac.core import World
from omni.isaac.core.objects import DynamicCuboid
import numpy as np

world = World()
world.scene.add_default_ground_plane()
fancy_cube = world.scene.add(
    DynamicCuboid(
        prim_path="/World/random_cube",
        name="fancy_cube",
        position=np.array([0, 0, 1.0]),
        scale=np.array([0.5015, 0.5015, 0.5015]),
        color=np.array([0, 0, 1.0]),
    ))
# Resetting the world needs to be called before querying anything related to an articulation specifically.
# Its recommended to always do a reset after adding your assets, for physics handles to be propagated properly
world.reset()
for i in range(500):
    position, orientation = fancy_cube.get_world_pose()
    linear_velocity = fancy_cube.get_linear_velocity()
    # will be shown on terminal
    print("Cube position is : " + str(position))
    print("Cube's orientation is : " + str(orientation))
    print("Cube's linear velocity is : " + str(linear_velocity))
    # we have control over stepping physics and rendering in this workflow
    # things run in sync
    world.step(render=True) # execute one physics step and one rendering step

simulation_app.close() # close Isaac Sim

```

I get the error below. Why am I getting this error?

 ![Screenshot from 2023-01-31 13-27-51](https://global.discourse-cdn.com/nvidia/original/3X/c/2/c241b93081e9ab4d35b0c782e21ebda7e01d8930.png)  
 ![Screenshot from 2023-01-31 13-28-04](https://global.discourse-cdn.com/nvidia/original/3X/5/8/58aec4d4b2423ca46a32c1298ccfb35c07a0f55f.png)  
 ![image](https://global.discourse-cdn.com/nvidia/original/3X/a/1/a1e86abffeacc1447b259b6cc052086f571d5643.png)

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<div class="post-metadata">

**Author:** ![mona.jalal](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/mona.jalal/32/243872_2.png) [@mona.jalal](https://forums.developer.nvidia.com/u/mona.jalal)\
**Post date:** [January 31, 2023, 8:53pm UTC](https://forums.developer.nvidia.com/t/error-running-isaac-sim-hello-world-example/241181/2 "2023-01-31T20:53:39Z")

</div>

closing and opening Isaac Sim resolved the issue.

---

<div class="post-metadata">

**Author:** ![system](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/system/32/68080_2.png) [@system](https://forums.developer.nvidia.com/u/system)\
**Post date:** [February 14, 2023, 8:54pm UTC](https://forums.developer.nvidia.com/t/error-running-isaac-sim-hello-world-example/241181/3 "2023-02-14T20:54:19Z")

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Closed on February 14, 2023, 8:54pm UTC

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