I keep getting this error

[Useruses]

Error: invalid hexlify value (argument="value", value="my mnemonic", code=INVALID_ARGUMENT, version=bytes/5.1.0)
at Logger.makeError (C:\Users\comp\Downloads\update-bot\node_modules@ethersproject\logger\lib\index.js:180:21)
at Logger.throwError (C:\Users\com\Downloads\update-bot\node_modules@ethersproject\logger\lib\index.js:189:20)
at Logger.throwArgumentError (C:\Users\comp\Downloads\update-bot\node_modules@ethersproject\logger\lib\index.js:192:21)
at Object.hexlify (C:\Users\comp\Downloads\update-bot\node_modules@ethersproject\bytes\lib\index.js:190:19)
at new SigningKey (C:\Users\comp\Downloads\update-bot\node_modules@ethersproject\signing-key\lib\index.js:20:65)
at new Wallet (C:\Users\comp\Downloads\update-bot\node_modules@ethersproject\wallet\lib\index.js:123:36)
at file:///C:/Users/comp/Downloads/update-bot/bot.js:38:16
at ModuleJob.run (internal/modules/esm/module_job.js:152:23)
at async Loader.import (internal/modules/esm/loader.js:177:24)
at async Object.loadESM (internal/process/esm_loader.js:68:5) {
reason: 'invalid hexlify value',
code: 'INVALID_ARGUMENT',
argument: 'value',
value: 'my mnemonic'
}

[Nafidinara]

Put your private key on mnemonic variable, then run again

[Useruses]

I already have put it, I just replaced it with "my mnemonic" in the error message.
Here is how the line 22 looks, (my mnenomic instead of the private key):
const mnemonic = 'my mnemonic'

[Nafidinara]

try to see this reference : ethers-io/ethers.js#1166

[Useruses]

try to see this reference : ethers-io/ethers.js#1166

Ok thank you.