Error Codes

Debug table of revert strings encountered when calling yb-core contracts. Strings are drawn from yb-core-master source. ERC-4626 strings (erc4626: deposit/mint/withdraw/redeem more than maximum) are listed once per family rather than repeated for each method.

Core

LT.vy

String	Cause
Access	Caller neither admin nor factory admin
Already set	Second set_amm
Slippage	min_shares / min_assets not met
Debt too high	Deposit/redeem value would exceed AMM.max_debt() / 2
Withdrawing nothing	withdraw(0)
Withdraw to/from staker	Staker is msg.sender or receiver
We're dead. Use emergency_withdraw	Normal withdraw while AMM killed
Remainder too small	Supply would drop below MIN_SHARE_REMAINDER (1e6)
Deposit to staker	receiver == staker in deposit
N>2	Constructor: Cryptoswap pool has more than 2 coins (coins(2) did not revert)
receiver	emergency_withdraw: emergency-admin / admin caller must set receiver == owner
owner	emergency_withdraw: non-owner caller is not the position owner
Not killed	Emergency withdrawal path used while AMM is live
Need factory	withdraw_admin_fees called when admin is not a factory contract
Killed	Admin-fee withdrawal while AMM killed
No fee_receiver	Factory fee receiver is unset
Staker=fee_receiver	Fee receiver equals staker
Loss made admin fee negative	Admin-fee withdrawal attempted while admin bucket is negative
Staker already set	Second set_staker
GAS	Gauge checkpoint retry path: _checkpoint_gauge falls back to a fixed-gas call (200k) and requires the caller to supply at least that much — guards against gas-griefing of reward checkpoints

AMM.vy

String	Cause
Fee too high	Constructor: fee > MAX_FEE (10%). set_fee reverts without a message on the same check.
Unsafe min	debt < coll_value · MIN_SAFE_DEBT / 1e18
Unsafe max	debt > coll_value · MAX_SAFE_DEBT / 1e18
Access	set_rate / set_fee / set_killed from non-LT
Access violation	_deposit / _withdraw from non-LT
Rate too high	rate > MAX_RATE (100% APR)
Amount too large	get_dy(i=0, in_amount > debt)
Slippage	exchange with out < min_out
Empty AMM	exchange with collateral_amount == 0
Bad final state	Post-swap x0 < x0_pre

VirtualPool.vy

String	Cause
Wrong caller	onFlashLoan not from FACTORY.flash()
Slippage	Output below min_out

Factory.vy

String	Cause
Access	Non-admin on admin function
Wrong stablecoin	Pool's coin 0 ≠ factory STABLECOIN
Only set once	set_mint_factory re-called
Minter	set_allocator targets mint_factory
Already set	set_gauge_controller re-called
Admin fee too high	min_admin_fee > 1e18
Bad aggregator	Init / set_agg with agg.price() ∉ [0.9e18, 1.1e18) (open interval, both ends)
Too many markets	market_count ≥ 50000
Nonexistent market	fill_staker_vpool(i ≥ market_count)

HybridVault.vy

String	Cause
Already initialized	Re-init
Access	Generic non-owner caller on owner-only function (deposit, withdraw, emergency_withdraw, stake, unstake, redeem_crvusd, withdraw_scrvusd, recover_tokens)
Only admin	set_personal_limit from non-vault-factory-admin
Only owner	Owner-gated call from non-owner (set_crvusd_vault)
Vault not allowed	New crvusd_vault not in allow-list
Has active positions	set_crvusd_vault while positions exist
Bad pool_id	market.lt == 0
Not enough crvUSD	Insufficient backing without deposit_stablecoins flag
Beyond pool limit	Deposit exceeds cap
Debt made too high	Sanity: debt > 1.1 · additional_crvusd
No liquidity given	lt_shares == 0 from deposit
Cannot withdraw stables	Oracle broken, not opting into stablecoin path
Not enough crvUSD left	Backing would drop below requirement
Token not allowed	recover_tokens targets protected token
Oracle is broken	Global and per-pool oracle both fail
Zero shares	emergency_withdraw(0)

HybridVaultFactory.vy

String	Cause
Already created	User already has a vault
Vault not allowed	crvusd_vault not in allow-list
Vault impl not set	vault_impl == 0
Access	Non-ADMIN on admin function
Only vaults can call	update_* from non-registered vault
Vault wind-down	Requirement increase on disallowed vault
Beyond vault limit	Increase exceeds crvusd_vault_limits

LTMigrator.vy

String	Cause
lt_to deprecated	Migration target has been deprecated
not enough out	shares_out < min_out in migrate_staked

DAO

YB.vy

String	Cause
erc20: access is denied	emit not from a minter

VotingEscrow.vy

String	Cause
Min value	create_lock / increase_amount value < UMAXTIME
Withdraw old tokens first	create_lock with existing lock
Can only lock until time in the future	unlock_time ≤ now
Voting lock can be 4 years max	Exceeds 4y
No existing lock found	increase_amount on empty
Cannot add to expired lock. Withdraw	Expired lock
Nothing is locked	increase_unlock_time on empty
Lock expired	Expired lock
Can only increase lock duration	New end ≤ current end
Not allowed	infinite_lock_toggle blocked by clearance checker
The lock didn't expire	withdraw before expiry
Not supported	delegate / delegateBySig
erc721: caller is not token owner or approved	Transfer auth fail
Wrong token ID	Token ID mismatches owner's address
Need max veLock	Transfer with non-max or non-infinite locks

GaugeController.vy

String	Cause
Gauge already added	Duplicate gauge registration
Gauge not alive	Gauge has no live weight
Vote checker not set	veYB's transfer_clearance_checker ≠ this
Mismatch in lengths	Array-length mismatch
Expired	User's veYB lock expired
Weight too large	Single weight > 10000 bps
Killed	Voting for killed gauge
Gauge not added	Unregistered gauge (vote_for_gauge_weights or set_killed)
Cannot vote so often	Same-gauge re-vote within 10 days
Used too much power	Sum of veYB vote weights across gauges exceeds 10000 bps (100%) after this vote

LiquidityGauge.vy

String	Cause
YB	add_reward / deposit_reward targets YB
LP_TOKEN	add_reward targets LT
Already added	Duplicate add_reward
Not added	Unknown reward in change_reward_distributor / deposit_reward
No rewards	deposit_reward(0)
Finishes in the past	New finish time ≤ now
Rate unknown	Extending past old finish time
No reward	Zero distributor
erc4626: deposit/mint/withdraw/redeem more than maximum	Cap breach
receiver	Kill-mode redeem with receiver ≠ owner

FeeDistributor.vy

String	Cause
Ded	fill_epochs when killed
Might be a vest	Fee claim routed through a vesting escrow when direct receiver rules do not allow it

InflationaryVest.vy

String	Cause
Admin required	start / set_recipient from non-owner
Already started	Second start()

VestingEscrow.vy

String	Cause
Lengths mismatch	fund with mismatched arrays
Rugged	Re-target rugged recipient
Disabled	Re-fund disabled recipient
Cannot disable	toggle_disable when can_disable = False
Not disabled	rug_disabled on enabled

CliffEscrow.vy

String	Cause
Empty recipient	initialize(recipient=0)
Already initialized	Re-init
Cliff still applies	Transfer/approve before unlock_time
Not authorized	Non-recipient ve op
Cannot recover YB	recover_token(YB)

SnapshotSplitter.vy

String	Cause
Already claimed	Double-claim

CallComparator.vy

String	Cause
Not equal	check_equal
Equal	check_nonequal
Not greater	check_gt
Not less	check_lt
Timestamp not greater	check_timestamp_gt
Timestamp not less	check_timestamp_lt
Too early	check_called_after rate limit

TokenSender, Multisend, StakeZap

No custom revert strings. Fail on token-transfer reverts.

Related

• Event Catalog
• Core: AMM
• Core: LT