Truffle Debug fails in two distinct ways

[TrentKennelly]

I have a few failed mainnet transactions and can't seem to use truffle debug to discover the problem. The contract is verified on Etherscan, and you can see it here: https://goerli.etherscan.io/address/0xD000670c7e3b7ab43bAdBd0b038E4cF6bDfd0236

When I use truffle debug alone I will get a response like this:

truffle debug --network mainnet
Starting Truffle Debugger...
TypeError: Cannot create property 'gasLimit' on string '0xfe7b24'
    at Method.outputBlockFormatter (/usr/local/lib/node_modules/truffle/build/webpack:/node_modules/web3-core-helpers/lib/formatters.js:269:1)
    at Method.web3.eth.getBlock.method.outputFormatter (/usr/local/lib/node_modules/truffle/build/webpack:/packages/interface-adapter/dist/shim/overloads/ethereum.js:38:1)
    at Method.formatOutput (/usr/local/lib/node_modules/truffle/build/webpack:/node_modules/web3-core-method/lib/index.js:148:1)
    at sendTxCallback (/usr/local/lib/node_modules/truffle/build/webpack:/node_modules/web3-core-method/lib/index.js:536:1)
    at processTicksAndRejections (node:internal/process/task_queues:82:21)
Truffle v5.7.1 (core: 5.7.1)
Node v18.12.1

If I add a transaction hash like this: truffle debug 0x5a748a0fd8c21898021823a424da94576f5d794ed9867bd62a7bd3027473ce00 --network mainnet then this happens:

`Starting Truffle Debugger...
✓ Compiling your contracts...
✖ Gathering information about your project and the transaction...
ProviderError: The method debug_traceTransaction does not exist/is not available
    at /usr/local/lib/node_modules/truffle/build/webpack:/packages/provider/wrapper.js:122:1
    at /usr/local/lib/node_modules/truffle/build/webpack:/packages/provider/wrapper.js:160:1
    at /Users/TrentKennelly/trading_bot_V2/node_modules/web3-provider-engine/index.js:232:9
    at /Users/TrentKennelly/trading_bot_V2/node_modules/async/internal/once.js:12:16
    at replenish (/Users/TrentKennelly/trading_bot_V2/node_modules/async/internal/eachOfLimit.js:61:25)
    at /Users/TrentKennelly/trading_bot_V2/node_modules/async/internal/eachOfLimit.js:71:9
    at eachLimit (/Users/TrentKennelly/trading_bot_V2/node_modules/async/eachLimit.js:43:36)
    at /Users/TrentKennelly/trading_bot_V2/node_modules/async/internal/doLimit.js:9:16
    at end (/Users/TrentKennelly/trading_bot_V2/node_modules/web3-provider-engine/index.js:211:5)
    at WebsocketSubprovider._handleSocketMessage (/Users/TrentKennelly/trading_bot_V2/node_modules/web3-provider-engine/subproviders/websocket.js:121:14)
    at WebSocket.onMessage (/Users/TrentKennelly/trading_bot_V2/node_modules/web3-provider-engine/node_modules/ws/lib/event-target.js:120:16)
    at WebSocket.emit (node:events:513:28)
    at WebSocket.emit (node:domain:489:12)
    at Receiver.receiverOnMessage (/Users/TrentKennelly/trading_bot_V2/node_modules/web3-provider-engine/node_modules/ws/lib/websocket.js:720:20)
    at Receiver.emit (node:events:513:28)
    at Receiver.emit (node:domain:489:12)
    at Receiver.dataMessage (/Users/TrentKennelly/trading_bot_V2/node_modules/web3-provider-engine/node_modules/ws/lib/receiver.js:414:14)
    at /Users/TrentKennelly/trading_bot_V2/node_modules/web3-provider-engine/node_modules/ws/lib/receiver.js:371:23
    at /Users/TrentKennelly/trading_bot_V2/node_modules/web3-provider-engine/node_modules/ws/lib/permessage-deflate.js:307:9
    at /Users/TrentKennelly/trading_bot_V2/node_modules/web3-provider-engine/node_modules/ws/lib/permessage-deflate.js:389:7
    at afterWrite (node:internal/streams/writable:500:5)
    at onwrite (node:internal/streams/writable:480:7)
    at Zlib.cb (node:internal/streams/transform:190:7)
    at Zlib.processCallback (node:zlib:613:8)

Commands:
(enter) last command entered (step next)
(o) step over, (i) step line / step into, (u) step out, (n) step next
(c) continue until breakpoint, (Y) reset & continue to previous error
(y) (if at end) reset & continue to final error
(;) step instruction (include number to step multiple)
(g) turn on generated sources, (G) turn off generated sources except via `;`
(p) print instruction & state (`p [mem|cal|sto]*`; see docs for more)
(l) print additional source context (`l [+<lines-ahead>] [-<lines-back>]`)
(s) print stacktrace, (e) Print recent events (`e [<number>|all]`)
(q) quit, (r) reset, (t) load new transaction, (T) unload transaction
(b) add breakpoint (`b [[<source-file>:]<line-number>]`; see docs for more)
(B) remove breakpoint (similar to adding, or `B all` to remove all)
(+) add watch expression (`+:<expr>`), (-) remove watch expression (-:<expr>)
(?) list existing watch expressions and breakpoints
(v) print variables and values (`v [bui|glo|con|loc]*`)
(:) evaluate expression - see `v`, (h) print this help`

So clearly it's running in the second version, but just claiming debug_traceTransaction doesn't exist. Any thoughts on what I'm doing wrong / how I can fix this?

[5uryaprakashPi]

Any solution for this or work around. I'm facing this when I run truffle migrate --network sepolia

[marcocastignoli]

me too, did you solve it?

[TrentKennelly]

Nope, sorry y'all. Never received a response on this. I determined in other ways that my transaction was likely failing due to a faulty calculation on my part. I was making my life too hard for no reason by trying to calculate getAmountsOut separately, rather than using the Uniswap V2 method.

[haltman-at]

Hi, sorry, only just saw this!

I have no idea what's up with the first error. You should likely file an issue about that.

As for the second -- the debugger relies on the debug_traceTransaction debugging RPC method. Lots of clients that aren't made for debugging use won't support it. The easiest way to deal with this is to, instead of debugging directly against your mainnet provider, fork it with Ganache (for instance), and debug against that instead.

Hope that's helpful!