# Getting Type not supported error when running \`fuels build\`

**URL:** <https://forum.fuel.network/t/getting-type-not-supported-error-when-running-fuels-build/6678>\
**Category:** Sway\
**Created:** [September 24, 2024, 10:45am UTC](https://forum.fuel.network/t/getting-type-not-supported-error-when-running-fuels-build/6678 "2024-09-24T10:45:53Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![sch1zo](https://avatars.discourse-cdn.com/v4/letter/s/57b2e6/32.png) [@sch1zo](https://forum.fuel.network/u/sch1zo)\
**Post date:** [September 24, 2024, 10:45am UTC](https://forum.fuel.network/t/getting-type-not-supported-error-when-running-fuels-build/6678/1 "2024-09-24T10:45:53Z")

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I have successfully compiled and deployed my smart contract and getting 0 errors but when I am building contract using `npx fuels build` I’m getting error  
 ![image](https://us1.discourse-cdn.com/flex022/uploads/fuel/original/2X/a/a9cf94af547946710d7ae5d0dc7bdabf16a02bed.png)

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**Author:** ![nick](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.fuel.network/nick/32/2330_2.png) [@nick](https://forum.fuel.network/u/nick)\
**Post date:** [September 24, 2024, 11:26am UTC](https://forum.fuel.network/t/getting-type-not-supported-error-when-running-fuels-build/6678/2 "2024-09-24T11:26:37Z")

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Can you provide the results of `fuelup show`, your TS SDK version and any code snippets, repos or gists for better context?

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**Author:** ![anderson](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.fuel.network/anderson/32/320_2.png) [@anderson](https://forum.fuel.network/u/anderson)\
**Post date:** [September 24, 2024, 12:49pm UTC](https://forum.fuel.network/t/getting-type-not-supported-error-when-running-fuels-build/6678/3 "2024-09-24T12:49:12Z")

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@sch1zo It seems you are running an outdated version of the TS SDK.

Could you update it to the last version and let us know if the problem is resolved?

> **[Release v0.94.6 · FuelLabs/fuels-ts](https://github.com/FuelLabs/fuels-ts/releases/tag/v0.94.6)**
>
> Summary
> In this release, we:
> 
> Implemented TransactionUpgrade and TransactionUpload
> The provider.url now returns an authenticated URL
> The Provider now accepts a headers field
> Added UI tests to the c...