# Cant sove ethernaut CTFs

**URL:** <https://forum.openzeppelin.com/t/cant-sove-ethernaut-ctfs/33182>\
**Category:** Ethernaut\
**Created:** [November 17, 2022, 10:57am UTC](https://forum.openzeppelin.com/t/cant-sove-ethernaut-ctfs/33182 "2022-11-17T10:57:18Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Yahia\_Khaled](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.openzeppelin.com/yahia_khaled/32/16976_2.png) [@Yahia\_Khaled](https://forum.openzeppelin.com/u/Yahia_Khaled)\
**Post date:** [November 17, 2022, 10:57am UTC](https://forum.openzeppelin.com/t/cant-sove-ethernaut-ctfs/33182/1 "2022-11-17T10:57:18Z")

</div>

I get this message while starting any instance...  
Unable to retrieve level instance! Please check gas amount and try again.,TypeError: Cannot read properties of undefined (reading 'args')  
and the transaction is done

> **[Polygon Transaction Hash (Txhash) Details | PolygonScan](https://mumbai.polygonscan.com/tx/0xf3910e79deda542f3ebf23b06ef4da9977f7e8d9ad5260b1873ce895ae209eaf)**
>
> Polygon (MATIC) detailed transaction info for txhash 0xf3910e79deda542f3ebf23b06ef4da9977f7e8d9ad5260b1873ce895ae209eaf. The transaction status, block confirmation, gas fee, MATIC, and token transfer are shown.

how to solve this problem??