Troubleshooting Errors

Issues on the Exchange

INSUFFICIENT_OUTPUT_AMOUNT

The transaction cannot succeed due to the error: FusionXRouter:INSUFFICIENT_OUTPUT_AMOUNT. This is probably an issue with one of the tokens you are swapping.

You're trying to swap tokens, but your slippage tolerance is too low or liquidity is too low.

  1. Refresh your page and try again later.

  2. Try trading a smaller amount at one time.

  3. Increase your slippage tolerance:

    1. Tap the settings icon on the liquidity page.

    2. Increase your slippage tolerance a little and try again.

  4. Lastly, try inputting an amount with fewer decimal places.

INSUFFICIENT_A_AMOUNT or INSUFFICIENT_B_AMOUNT

Fail with error 'FusionXRouter: INSUFFICIENT_A_AMOUNT' or Fail with error 'FusionXRouter: INSUFFICIENT_B_AMOUNT'

You're trying to add/remove liquidity from a liquidity pool (LP), but there isn't enough of one of the two tokens in the pair.

Refresh your page and try again, or try again later.

Still doesn't work?

  1. Tap the settings icon on the liquidity page.

  2. Increase your slippage tolerance a little and try again.

Transaction cannot succeed

Try trading a smaller amount, or increase slippage tolerance via the settings icon and try again. This is caused by low liquidity.

Price Impact too High

Try trading a smaller amount, or increase slippage tolerance via the settings icon and try again. This is caused by low liquidity.

EstimateGas failed

This transaction would fail. Please contact support

If you got this error while removing liquidity from a MNT pair:

Please select "Receive MNT" and retry.

If you got this error while trying to swap:

Please contact the project team of the token you're trying to swap.** **This issue must be resolved by the project team.

Cannot read property 'toHexString' of undefined

"Unknown error: "Cannot read property 'toHexString' of undefined"

  1. Check to make sure you have sufficient funds available.

  2. Ensure you have given the contract allowance to spend the amount of funds you're attempting to trade with.

Out of Gas error

Warning! Error encountered during contract execution [out of gas]

You have set a low gas limit when trying to make a transaction.

Try manually increasing the gas limit (not gas price!) in your wallet before signing the transaction.

A limit of 200000 is usually enough.

The above example is from Metamask; check your wallet's documentation if you aren't sure how to adjust the gas limit.

ERC20: transfer amount exceeds allowance

Fail with error 'ERC20: transfer amount exceeds allowance'

  1. Use Unrekt.net to revoke approval for the smart contract you're trying to interact with

  2. Approve the contract again, without setting a limit on spend allowance

  3. Try interacting with the contract again.

ERC20: transfer amount exceeds balance

Fail with error 'ERC20: transfer amount exceeds balance'

You're probably trying to unstake from a Pool with low rewards in it. Solution below.

If not, you may be trying to send tokens that you don't have in your wallet (for example, trying to send a token that is already assigned to a pending transaction). In this case, just make sure you have the tokens you're trying to use.

Firstly, let the team know which pool you're trying to unstake from, so they can top up the rewards. If you're in a hurry to unstake and you don't mind losing your pending yield, try an emergencyWithdraw:

You can perform an โ€œemergencyWithdrawโ€ from the contract directly to unstake your staked tokens.

  1. Find the contract address of the Pool you're trying to unstake from. You can find it in your wallet's transaction log.

  2. Go to https://explorer.mantle.xyz/ and in the search bar, enter the contract address.

  3. Select Write Contract.

  4. In section โ€œ4. emergencyWithdrawโ€, enter "0" and click โ€œWriteโ€.

This will unstake your staked tokens and lose any uncollected yield.

This will lose any yield that you havenโ€™t harvested yet.

Unsupported Chain ID

Switch your network to Mantle Network. Check your wallet's documentation for a guide if you need help.

Internal JSON-RPC errors

"MetaMask - RPC Error: Internal JSON-RPC error. estimateGas failed removeLiquidityETHWithPermitSupportingFeeOnTransferTokens estimateGas failed removeLiquidityETHWithPermit "

Happens when trying to remove liquidity on some tokens via Metamask. Root cause is still unknown. Try using an alternative wallet.

Internal JSON-RPC error. { "code": -32000, "message": "insufficient funds for transfer" } - Please try again.

You don't have enough MNT to pay for the transaction fees. You need more ERC-20 network MNT in your wallet.

Error: [ethjs-query]

Error: [ethjs-query] while formatting outputs from RPC '{"value":{"code":-32603,"data":{"code":-32000,"message":"transaction underpriced"}}}"

Increase the gas limit for the transaction in your wallet. Check your wallet's documentation to learn how to increase gas limit.

Swap failed: Error: [ethjs-query] while formatting outputs from RPC '{"value":{"code":-32603,"data":{"code":-32603,"message":"handle request error"}}}'

Cause unclear. Try these steps before trying again:

  1. Increase gas limit

  2. Increase slippage

  3. Clear cache

Checking username keeps spinning

There are two possible causes.

  1. You have multiple wallets installed on the browser.

  2. Network issue.

Root cause: You have multiple wallets installed on the browser. It may make a conflict between wallets. This is out of FusionX Finance's control and we can do nothing.

  1. Have only single wallet installed on browser, remove the others.

  2. Reconnect the wallet and retry setting username again.

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