I am getting NPM error in my Azure devops pipeline

Question

How do i fix the npm error in my pipeline?

/opt/hostedtoolcache/node/16.13.2/x64/bin/npm ci

npm WARN old lockfile

npm WARN old lockfile The package-lock.json file was created with an old version of npm,

npm WARN old lockfile so supplemental metadata must be fetched from the registry.

npm WARN old lockfile

npm WARN old lockfile This is a one-time fix-up, please be patient...

npm WARN old lockfile

npm ERR! code 1

npm ERR! path /home/vsts/work/1/s/node_modules/node-sass

npm ERR! command failed

npm ERR! command sh -c node scripts/build.js

npm ERR! Building: /opt/hostedtoolcache/node/16.13.2/x64/bin/node /home/vsts/work/1/s/node_modules/node-gyp/bin/node-gyp.js rebuild --verbose --libsass_ext= --libsass_cflags= --libsass_ldflags= --libsass_library=

npm ERR! gyp info it worked if it ends with ok

npm ERR! gyp verb cli [

npm ERR! gyp verb cli '/opt/hostedtoolcache/node/16.13.2/x64/bin/node',

npm ERR! gyp verb cli '/home/vsts/work/1/s/node_modules/node-gyp/bin/node-gyp.js',

npm ERR! gyp verb cli 'rebuild',

npm ERR! gyp verb cli '--verbose',

npm ERR! gyp verb cli '--libsass_ext=',

npm ERR! gyp verb cli '--libsass_cflags=',

npm ERR! gyp verb cli '--libsass_ldflags=',

npm ERR! gyp verb cli '--libsass_library='

npm ERR! gyp verb cli ]

npm ERR! gyp info using node-gyp@3.8.0

npm ERR! gyp info using node@16.13.2 | linux | x64

npm ERR! gyp verb command rebuild []

npm ERR! gyp verb command clean []

npm ERR! gyp verb clean removing "build" directory

npm ERR! gyp verb command configure []

npm ERR! gyp verb check python checking for Python executable "python2" in the PATH

npm ERR! gyp verb which failed Error: not found: python2

npm ERR! gyp verb which failed at getNotFoundError (/home/vsts/work/1/s/node_modules/which/which.js:13:12)

npm ERR! gyp verb which failed at F (/home/vsts/work/1/s/node_modules/which/which.js:68:19)

npm ERR! gyp verb which failed at E (/home/vsts/work/1/s/node_modules/which/which.js:80:29)

npm ERR! gyp verb which failed at /home/vsts/work/1/s/node_modules/which/which.js:89:16

npm ERR! gyp verb which failed at /home/vsts/work/1/s/node_modules/isexe/index.js:42:5

npm ERR! gyp verb which failed at /home/vsts/work/1/s/node_modules/isexe/mode.js:8:5

I am trying npm clean install but this is failing.