issues on ubuntu 20.04

[DramaCrypto]

I installed Flow CLI and node js Next I execute npm run dev:testnet

but issues happened like below :

[email protected] dev:testnet npx cross-env CHAIN_ENV=testnet node .ki-scripts/startup.js

ℹ Stopping previously launched processes...

xargs - Usage: kill [options] [...]

Options: [...] send signal to every listed -, -s, --signal specify the to be sent -l, --list=[] list all signal names, or convert one to a name -L, --table list all signal names in a nice table

-h, --help display this help and exit -V, --version output version information and exit

For more details see kill(1).

node:internal/process/promises:279 triggerUncaughtException(err, true /* fromPromise */); ^

[UnhandledPromiseRejection: This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). The promise rejected with the reason "undefined".] { code: 'ERR_UNHANDLED_REJECTION' }

[bluesign]

not a solution but as a workaround you can comment out: https://github.com/onflow/kitty-items/blob/74b0b58fdf89560ac65e11e740c08bf0410db5eb/.ki-scripts/startup.js#L134