TooExpensive when executing XCM BuyExecution

[jiguantong]

2022-06-20 20:48:24.066 TRACE tokio-runtime-worker xcm::barriers: [Parachain] AllowTopLevelPaidExecutionFrom origin: MultiLocation { parents: 1, interior: X1(Parachain(2000)) }, message: Xcm([WithdrawAsset(MultiAssets([MultiAsset { id: Concrete(MultiLocation { parents: 0, interior: X1(PalletInstance(5)) }), fun: Fungible(80000000000000000000) }])), ClearOrigin, BuyExecution { fees: MultiAsset { id: Concrete(MultiLocation { parents: 0, interior: X1(PalletInstance(5)) }), fun: Fungible(80000000000000000000) }, weight_limit: Limited(7000000000) }, DepositAsset { assets: Wild(All), max_assets: 1, beneficiary: MultiLocation { parents: 0, interior: X1(AccountId32 { network: Any, id: [212, 53, 147, 199, 21, 253, 211, 28, 97, 20, 26, 189, 4, 169, 159, 214, 130, 44, 133, 88, 133, 76, 205, 227, 154, 86, 132, 231, 165, 109, 162, 125] }) } }]), max_weight: 4000000000, weight_credit: 0
2022-06-20 20:48:24.066 TRACE tokio-runtime-worker xcm::execute: [Parachain] origin: Some(MultiLocation { parents: 1, interior: X1(Parachain(2000)) }), total_surplus/refunded: 0/0, error_handler_weight: 0
2022-06-20 20:48:24.066 TRACE tokio-runtime-worker xcm::currency_adapter: [Parachain] withdraw_asset what: MultiAsset { id: Concrete(MultiLocation { parents: 0, interior: X1(PalletInstance(5)) }), fun: Fungible(80000000000000000000) }, who: MultiLocation { parents: 1, interior: X1(Parachain(2000)) }
2022-06-20 20:48:24.066 TRACE tokio-runtime-worker xcm::weight: [Parachain] UsingComponents::buy_weight weight: 4000000000, payment: <wasm:stripped>
2022-06-20 20:48:24.066 TRACE tokio-runtime-worker xcm::execute_xcm_in_credit: [Parachain] result: Err(ExecutorError { index: 2, xcm_error: TooExpensive, weight: 1000000000 })
2022-06-20 20:48:24.066 TRACE tokio-runtime-worker xcm::weight: [Parachain] UsingComponents::refund_weight weight: 1000000000
2022-06-20 20:48:24.066 DEBUG tokio-runtime-worker xcm::execute_xcm_in_credit: [Parachain] Execution errored at 2: TooExpensive (original_origin: MultiLocation { parents: 1, interior: X1(Parachain(2000)) })
2022-06-20 20:48:24.068  INFO tokio-runtime-worker sc_basic_authorship::basic_authorship: [Parachain] 🎁 Prepared block for proposing at 5675 (0 ms) [hash: 0xfccf10e15dbe5b5519e486cb95ea8175fa57a8b6cdf45600656b6c9029ef1576; parent_hash: 0xffa3…3a2f; extrinsics (2): [0x16a0…c151, 0xdc02…f84a]]
2022-06-20 20:48:24.070  INFO tokio-runtime-worker aura: [Parachain] 🔖 Pre-sealed block for proposal at 5675. Hash now 0xadc370fd0eb7705e5ca940fb68e585d77e88dec15fd5408d5bc5999e37afd035, previously 0xfccf10e15dbe5b5519e486cb95ea8175fa57a8b6cdf45600656b6c9029ef1576.
2022-06-20 20:48:24.072  INFO tokio-runtime-worker substrate: [Parachain] ✨ Imported #5675 (0xadc3…d035)
2022-06-20 20:48:24.072  INFO tokio-runtime-worker cumulus-collator: [Parachain] PoV size { header: 0.1796875kb, extrinsics: 3.41015625kb, storage_proof: 8.326171875kb }
2022-06-20 20:48:24.072  INFO tokio-runtime-worker cumulus-collator: [Parachain] Produced proof-of-validity candidate. block_hash=0xadc370fd0eb7705e5ca940fb68e585d77e88dec15fd5408d5bc5999e37afd035
2022-06-20 20:48:26.112  INFO tokio-runtime-worker substrate: [Parachain] 💤 Idle (0 peers), best: #5674 (0xffa3…3a2f), finalized #5673 (0x8263…d546), ⬇ 0.1kiB/s ⬆ 0.1kiB/s
2022-06-20 20:48:28.783  INFO tokio-runtime-worker substrate: [Relaychain] 💤 Idle (4 peers), best: #13773 (0x99f1…bc28), finalized #13771 (0x536e…5a1c), ⬇ 2.1kiB/s ⬆ 3.4kiB/s
2022-06-20 20:48:30.036  INFO tokio-runtime-worker substrate: [Relaychain] ✨ Imported #13774 (0xc824…2ad2)
2022-06-20 20:48:30.044  WARN tokio-runtime-worker parachain::collator-protocol: [Relaychain] No validators assigned to our core.
2022-06-20 20:48:31.112  INFO tokio-runtime-worker substrate: [Parachain] 💤 Idle (0 peers), best: #5674 (0xffa3…3a2f), finalized #5673 (0x8263…d546), ⬇ 30 B/s ⬆ 29 B/s
2022-06-20 20:48:33.784  INFO tokio-runtime-worker substrate: [Relaychain] 💤 Idle (4 peers), best: #13774 (0xc824…2ad2), finalized #13772 (0x4056…9971), ⬇ 1.3kiB/s ⬆ 1.1kiB/s
2022-06-20 20:48:36.040  INFO tokio-runtime-worker substrate: [Relaychain] ✨ Imported #13775 (0x3dfd…8743)
2022-06-20 20:48:36.057  INFO tokio-runtime-worker cumulus-collator: [Parachain] Starting collation. relay_parent=0x3dfdadc65f934fe870d9b8f397eb6923679feb0de28d3453f3db