# SDK Urcap error npm version error

**URL:** <https://forum.universal-robots.com/t/sdk-urcap-error-npm-version-error/38265>\
**Category:** URCap Development\
**Created:** [January 28, 2025, 4:06am UTC](https://forum.universal-robots.com/t/sdk-urcap-error-npm-version-error/38265 "2025-01-28T04:06:55Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![takumih0426](https://avatars.discourse-cdn.com/v4/letter/t/da6949/32.png) [@takumih0426](https://forum.universal-robots.com/u/takumih0426)\
**Post date:** [January 28, 2025, 4:06am UTC](https://forum.universal-robots.com/t/sdk-urcap-error-npm-version-error/38265/1 "2025-01-28T04:06:55Z")

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Hello. I am a university student in Japan, currently doing an internship using Universal Robots. I have a question because I encountered an issue. I downloaded SDK-polyscopex-0.14.74, opened VS Code from Ubuntu, and completed the setup. However, when I tried to run package.json, it didn’t work. I searched for the cause on other sites and tried to download npm, but that didn’t work either. Could you tell me which version is being used in package.json and what might be causing it not to work? My final task goal is to display the speed on the URcaps screen and check the route of the x, y, z coordinates using TCP. I am worried that I might not be able to complete the task within the internship period, so please help me. Thank you.2025-01-27T15:00:00Z

 ![スクリーンショット (61)](https://us1.discourse-cdn.com/flex020/uploads/universal_robots/original/2X/0/0484060c3146fa5cae2c5bbf53a0948e600a8730.png)

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**Author:** ![cg1](https://avatars.discourse-cdn.com/v4/letter/c/c77e96/32.png) [@cg1](https://forum.universal-robots.com/u/cg1)\
**Post date:** [January 28, 2025, 7:08pm UTC](https://forum.universal-robots.com/t/sdk-urcap-error-npm-version-error/38265/2 "2025-01-28T19:08:37Z")

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> [@takumih0426](#):
>
> e. I downloaded SDK-polyscopex-0.14.74, opened VS Code from Ubuntu, and completed the setup. However, when I tried to run package.json, it didn’t work. I searched for the cause on other sit

Hi Takumih

Ive personaly never needded to run

```auto
npm run start 

```

I start by opening the project inside the container  
see: [Get started with development Containers in Visual Studio Code](https://code.visualstudio.com/docs/devcontainers/tutorial)

then I simply follow the step laid out by the sdk cheat sheet:  
[https://docs.universal-robots.com/PolyScopeX\_SDK\_Documentation/build/SDK-v0.14/GettingStarted.html#cheatsheet](https://docs.universal-robots.com/PolyScopeX_SDK_Documentation/build/SDK-v0.14/GettingStarted.html#cheatsheet)

Note: I usually don’t define the port or the host

and then I just write `http://localhost/` in my chrome browser.  
Note: you will need to at extra stuff to this “web address” if you define the host and server. but this is also quite well described some where in the SDK documentation.

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<div class="post-metadata">

**Author:** ![takumih0426](https://avatars.discourse-cdn.com/v4/letter/t/da6949/32.png) [@takumih0426](https://forum.universal-robots.com/u/takumih0426)\
**Post date:** [January 29, 2025, 4:30am UTC](https://forum.universal-robots.com/t/sdk-urcap-error-npm-version-error/38265/3 "2025-01-29T04:30:37Z")

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I followed the given instructions, but I am still getting an error. It says that npm itself cannot be found in the official registry. Why is that?

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<div class="post-metadata">

**Author:** ![cg1](https://avatars.discourse-cdn.com/v4/letter/c/c77e96/32.png) [@cg1](https://forum.universal-robots.com/u/cg1)\
**Post date:** [January 29, 2025, 5:04pm UTC](https://forum.universal-robots.com/t/sdk-urcap-error-npm-version-error/38265/4 "2025-01-29T17:04:25Z")

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It sound like you have not open the project inside the docker container.  
maybe this link is a bit more clear then the first one I sent

> **[VS Code Remote Containers | Rancher Desktop Docs](https://docs.rancherdesktop.io/how-to-guides/vs-code-remote-containers/)**
>
> The \[Visual Studio Code Remote - Containers\] extension lets you use a Docker container as a full-featured development environment, which helps ensure a consistent environment across developer machines and makes it easy for new team members and...

And if this does not work please put in ALOT more details about what you are currently doing and not just the error. Please describe your whole process!