# FuelError: Invalid struct Vec. Field "buf" not present

**URL:** <https://forum.fuel.network/t/fuelerror-invalid-struct-vec-field-buf-not-present/6553>\
**Category:** TypeScript SDK\
**Tags:** testnet, feedback\
**Created:** [September 2, 2024, 3:39am UTC](https://forum.fuel.network/t/fuelerror-invalid-struct-vec-field-buf-not-present/6553 "2024-09-02T03:39:25Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![liny52](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.fuel.network/liny52/32/3338_2.png) [@liny52](https://forum.fuel.network/u/liny52)\
**Post date:** [September 2, 2024, 3:39am UTC](https://forum.fuel.network/t/fuelerror-invalid-struct-vec-field-buf-not-present/6553/1 "2024-09-02T03:39:25Z")

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“fuels”: “^0.94.2”

Error calling contract function: \_FuelError: Invalid struct Vec. Field “buf” not present.

This problem does not occur in fuels ^0.91.0 version

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<div class="post-metadata">

**Author:** ![p.s](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.fuel.network/p.s/32/2491_2.png) [@p.s](https://forum.fuel.network/u/p.s)\
**Post date:** [September 2, 2024, 4:59am UTC](https://forum.fuel.network/t/fuelerror-invalid-struct-vec-field-buf-not-present/6553/2 "2024-09-02T04:59:42Z")

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> [@liny52](#):
>
> This problem does not occur in fuels ^0.91.0 version

Hey liny52 👋

Could you share the output of `fuelup show` and the Sway contract code of the the function you’re trying to call please?