expo web failing at start

[patcito]

The error:

web  Starting Webpack on port 19006 in development mode.
(node:7716) UnhandledPromiseRejectionWarning: ValidationError: webpack Dev Server Invalid Options

options should NOT have additional properties

    at validateOptions (/home/plpp-2019/.config/yarn/global/node_modules/schema-utils/src/validateOptions.js:32:11)
    at new Server (/home/plpp-2019/.config/yarn/global/node_modules/webpack-dev-server/lib/Server.js:87:5)
    at server (/@expo/[email protected]/src/Webpack.ts:160:20)
    at new Promise (<anonymous>)
    at startAsync (/@expo/[email protected]/src/Webpack.ts:149:18)
    at processTicksAndRejections (internal/process/task_queues.js:97:5)
    at Object.openAsync (/@expo/[email protected]/src/Webpack.ts:203:5)
    at ReadStream.handleKeypress (/[email protected]/src/commands/start/TerminalUI.js:237:9)
(node:7716) UnhandledPromiseRejectionWarning: Unhandled promise rejection. 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(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 16)
(node:7716) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.