# Autotask cannot estimate gas; transaction may fail or may require manual gas limit
**URL:** https://forum.openzeppelin.com/t/autotask-cannot-estimate-gas-transaction-may-fail-or-may-require-manual-gas-limit/21018
**Category:** Defender
**Created:** [December 15, 2021, 11:50am UTC](https://forum.openzeppelin.com/t/autotask-cannot-estimate-gas-transaction-may-fail-or-may-require-manual-gas-limit/21018 "2021-12-15T11:50:46Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@rainbow](https://forum.openzeppelin.com/u/rainbow)
#### Post date: [December 15, 2021, 11:50am UTC](https://forum.openzeppelin.com/t/autotask-cannot-estimate-gas-transaction-may-fail-or-may-require-manual-gas-limit/21018/1 "2021-12-15T11:50:46Z")
I followed this guide: [https://docs.openzeppelin.com/defender/guide-keep3r](https://docs.openzeppelin.com/defender/guide-keep3r)
but every task is failing "cannot estimate gas; transaction may fail or may require manual gas limit"
**💻 Environment**
AutoTask Mainnet script from the guide
**📝Details**
I tried multiple speed and replacing it with gasPrice: 100000000000 but still failing
**🔢 Code to reproduce**
[https://github.com/OpenZeppelin/defender-autotask-examples/blob/master/keep3rs/src/frequent-keeper.js](https://github.com/OpenZeppelin/defender-autotask-examples/blob/master/keep3rs/src/frequent-keeper.js)
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### Author:  [@rainbow](https://forum.openzeppelin.com/u/rainbow)
#### Post date: [December 15, 2021, 12:27pm UTC](https://forum.openzeppelin.com/t/autotask-cannot-estimate-gas-transaction-may-fail-or-may-require-manual-gas-limit/21018/2 "2021-12-15T12:27:42Z")
lost 0.1 when i set the gas manually and autotask tried claiming reward without doing any work
and lost another 0.1 when it tried working a job and ran out of gas.
i cant afford this....
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### Author:  [@rainbow](https://forum.openzeppelin.com/u/rainbow)
#### Post date: [December 15, 2021, 1:13pm UTC](https://forum.openzeppelin.com/t/autotask-cannot-estimate-gas-transaction-may-fail-or-may-require-manual-gas-limit/21018/3 "2021-12-15T13:13:22Z")
ok after some investigation turns out keep3r is a scam. no jobs were done in the last 3 months. no jobs are available.
only jobs you can find you need atleast 30k$ bonded.
no warning on anything
defender and keep3r are a scam if you see this stay away I lost 1k$ i couldnt afford
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### Author:  [@spalladino](https://forum.openzeppelin.com/u/spalladino)
#### Post date: [December 15, 2021, 2:04pm UTC](https://forum.openzeppelin.com/t/autotask-cannot-estimate-gas-transaction-may-fail-or-may-require-manual-gas-limit/21018/4 "2021-12-15T14:04:27Z")
Hey @rainbow! I understand the Keep3r network is under active development, and there's even a [V2 out there](https://thekeep3r.network/). The network works by offering jobs to execute in exchange for rewards, and the first one to get to it obtains the reward - all others get rejected and the tx is reverted. It's a competitive setup, but certainly not a scam, so I'd advise you stay out of it unless you have a good understanding of how it works. As for Defender, it gives you the tools for automating operations on smart contracts, how you use it is up to you.