# Provider Error when unwrap()

**URL:** <https://forum.fuel.network/t/provider-error-when-unwrap/2680>\
**Category:** Rust SDK\
**Tags:** testnet\
**Created:** [May 25, 2023, 6:44am UTC](https://forum.fuel.network/t/provider-error-when-unwrap/2680 "2023-05-25T06:44:06Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![holyhansss](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.fuel.network/holyhansss/32/1047_2.png) [@holyhansss](https://forum.fuel.network/u/holyhansss)\
**Post date:** [May 25, 2023, 6:44am UTC](https://forum.fuel.network/t/provider-error-when-unwrap/2680/1 "2023-05-25T06:44:06Z")

</div>

If I unwrap() a value that I read from the contract, it generates the error below. It looks like provider error. I using `https://beta-3.fuel.network/graphql` as my rpc provider. Do you guys know about this error?

`thread 'testnet_tests::mint::mint' panicked at 'called `Result::unwrap()` on an `Err` value: ProviderError("Response errors; Unknown field \"fuelBlockSpend\" on type \"Message\".")', tests/testnet_tests/mint.rs:11:59`