Error installing dependencies for ch2/backend

[dileep-ehr]

Getting the following error on running npm install in ch2/backend

`/home/dileep/Documents/projects/Keycloak---Identity-and-Access-Management-for-Modern-Applications-2nd-Edition/ch2/backend/node_modules/chromedriver/install.js:122
const cdnBinariesUrl = (process.env.npm_config_chromedriver_cdnbinariesurl || process.env.CHROMEDRIVER_CDNBINARIESURL)?.replace(//+$/, '');
^

SyntaxError: Unexpected token '.'
at wrapSafe (internal/modules/cjs/loader.js:915:16)
at Module._compile (internal/modules/cjs/loader.js:963:27)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:1027:10)
at Module.load (internal/modules/cjs/loader.js:863:32)
at Function.Module._load (internal/modules/cjs/loader.js:708:14)
at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:60:12)
at internal/main/run_main_module.js:17:47
npm WARN keycloak-example-service@0.0.1 No description
npm WARN keycloak-example-service@0.0.1 No repository field.
npm WARN keycloak-example-service@0.0.1 No license field.
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: chromedriver@122.0.4 (node_modules/chromedriver):
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: chromedriver@122.0.4 install: node install.js
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: Exit status 1`

Application fails to start after that