# Swap error message
**URL:** https://community.metamask.io/t/swap-error-message/27483
**Category:** Swaps and Bridges
**Created:** [November 21, 2023, 10:51pm UTC](https://community.metamask.io/t/swap-error-message/27483 "2023-11-21T22:51:30Z")
**Posts on this page:** 8
**Page:** 1
### Author:  [@Olamilekansi](https://community.metamask.io/u/Olamilekansi)
#### Post date: [November 21, 2023, 10:51pm UTC](https://community.metamask.io/t/swap-error-message/27483/1 "2023-11-21T22:51:30Z")
Hi team
I swap some bnb to tbd and it swap successfully but now that I tried to swap it bact to bnb it’s showing this error message
“Unexpected error: can’t estimate gas fee for approve “
Please help me with this
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### Author:  [@tuya](https://community.metamask.io/u/tuya)
#### Post date: [November 21, 2023, 11:59pm UTC](https://community.metamask.io/t/swap-error-message/27483/2 "2023-11-21T23:59:03Z")
hi @Olamilekansi , welcome to MetaMask community 🦊
try the following:
- Get rid of all decimal numbers after the whole number.
- Increase slippage tolerance, such as 5%, 10%.
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### Author:  [@Olamilekansi](https://community.metamask.io/u/Olamilekansi)
#### Post date: [November 22, 2023, 6:02am UTC](https://community.metamask.io/t/swap-error-message/27483/3 "2023-11-22T06:02:02Z")
I’ve already done that it’s still not working
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### Author:  [@Olamilekansi](https://community.metamask.io/u/Olamilekansi)
#### Post date: [November 22, 2023, 6:08am UTC](https://community.metamask.io/t/swap-error-message/27483/4 "2023-11-22T06:08:53Z")
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### Author:  [@Maryam](https://community.metamask.io/u/Maryam)
#### Post date: [November 22, 2023, 6:55am UTC](https://community.metamask.io/t/swap-error-message/27483/5 "2023-11-22T06:55:44Z")
Hi @Olamilekansi,
Sometimes, this kind of error is related to the RPC you are using. Changing the RPC may resolve the issue. Using the following link add an appropriate RPC to your MetaMask (click on the small arrow at the bottom of the BNB network box to see the list and add one to your wallet)
https:// chainlist. org/
please remove the 2 spaces I inserted in the link.
For more information, please refer to the following link:
> **[How to add a custom network RPC](https://support.metamask.io/hc/en-us/articles/360043227612-How-to-add-a-custom-network-RPC)**
>
> Contents:
>
> Adding via Chainlist
> Adding popular networks quickly
> Adding networks manually
>
>
> MetaMask can access many more networks than just Ethereum mainnet: you can add any EVM-compatible network...
Let us know in case you need further assistance.
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### Author:  [@Maryam](https://community.metamask.io/u/Maryam)
#### Post date: [November 22, 2023, 7:23am UTC](https://community.metamask.io/t/swap-error-message/27483/6 "2023-11-22T07:23:40Z")
@Olamilekansi
I should add that if Tuya’s suggestion and what I suggested above did not work, the token “may” be a scam. Check the token on the explorer to see if it is legit or not.
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### Author:  [@tuya](https://community.metamask.io/u/tuya)
#### Post date: [November 22, 2023, 8:29am UTC](https://community.metamask.io/t/swap-error-message/27483/7 "2023-11-22T08:29:39Z")
hey, you can also try this:
Set transaction speed to instant in settings.
If it still doesn’t work, cut the trade size in half and only trade 50% each time.
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### Author:  [@system](https://community.metamask.io/u/system)
#### Post date: [December 21, 2023, 10:52pm UTC](https://community.metamask.io/t/swap-error-message/27483/8 "2023-12-21T22:52:09Z")
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