Error in deploying from git hub

Please help, I deployed the site manually from the build folder to the domain www.ajaykc.com
Now i want to link the bitbucket repo to update my website and i m getting this error. i even tried CI=npm run build going through all the support forums. but nothing works.
6:41:06 PM: Build ready to start

6:41:19 PM: build-image version: b0258b965567defc4a2d7e2f2dec2e00c8f73ad6

6:41:19 PM: build-image tag: v3.4.1

6:41:19 PM: buildbot version: e1f4178b0d9779ebad1b11d5b54739f82fed3c22

6:41:19 PM: Fetching cached dependencies

6:41:20 PM: Failed to fetch cache, continuing with build

6:41:20 PM: Starting to prepare the repo for build

6:41:20 PM: No cached dependencies found. Cloning fresh repo

6:41:20 PM: git clone git@bitbucket.org:ajaykc90/portfolio

6:41:23 PM: Preparing Git Reference refs/heads/master

6:41:25 PM: Different publish path detected, going to use the one specified in the Netlify configuration file: ‘build’ versus ‘build/’ in the Netlify UI

6:41:25 PM: Starting build script

6:41:25 PM: Installing dependencies

6:41:25 PM: Python version set to 2.7

6:41:26 PM: v12.18.0 is already installed.

6:41:27 PM: Now using node v12.18.0 (npm v6.14.4)

6:41:27 PM: Started restoring cached build plugins

6:41:27 PM: Finished restoring cached build plugins

6:41:27 PM: Attempting ruby version 2.7.1, read from environment

6:41:29 PM: Using ruby version 2.7.1

6:41:29 PM: Using PHP version 5.6

6:41:29 PM: 5.2 is already installed.

6:41:29 PM: Using Swift version 5.2

6:41:29 PM: Started restoring cached node modules

6:41:29 PM: Finished restoring cached node modules

6:41:29 PM: Installing NPM modules using NPM version 6.14.4

6:42:03 PM: > core-js@2.6.11 postinstall /opt/build/repo/node_modules/babel-runtime/node_modules/core-js

6:42:03 PM: > node -e “try{require(’./postinstall’)}catch(e){}”

6:42:03 PM: > core-js@3.6.5 postinstall /opt/build/repo/node_modules/core-js

6:42:03 PM: > node -e “try{require(’./postinstall’)}catch(e){}”

6:42:04 PM: > core-js-pure@3.6.5 postinstall /opt/build/repo/node_modules/core-js-pure

6:42:04 PM: > node -e “try{require(’./postinstall’)}catch(e){}”

6:42:07 PM: npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.2.13 (node_modules/webpack-dev-server/node_modules/fsevents):

6:42:07 PM: npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.2.13: wanted {“os”:“darwin”,“arch”:“any”} (current: {“os”:“linux”,“arch”:“x64”})

6:42:07 PM: npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.2.13 (node_modules/watchpack-chokidar2/node_modules/fsevents):

6:42:07 PM: npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.2.13: wanted {“os”:“darwin”,“arch”:“any”} (current: {“os”:“linux”,“arch”:“x64”})

6:42:07 PM: npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.2.13 (node_modules/jest-haste-map/node_modules/fsevents):

6:42:07 PM: npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.2.13: wanted {“os”:“darwin”,“arch”:“any”} (current: {“os”:“linux”,“arch”:“x64”})

6:42:07 PM: npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@2.1.2 (node_modules/fsevents):

6:42:07 PM: npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@2.1.2: wanted {“os”:“darwin”,“arch”:“any”} (current: {“os”:“linux”,“arch”:“x64”})

6:42:07 PM: added 1587 packages from 748 contributors and audited 1594 packages in 36.021s

6:42:08 PM: 67 packages are looking for funding

6:42:08 PM: run npm fund for details

6:42:08 PM: found 0 vulnerabilities

6:42:08 PM: NPM modules installed

6:42:08 PM: Started restoring cached go cache

6:42:08 PM: Finished restoring cached go cache

6:42:09 PM: go version go1.14.4 linux/amd64

6:42:09 PM: go version go1.14.4 linux/amd64

6:42:09 PM: Installing missing commands

6:42:09 PM: Verify run directory

6:42:10 PM: ​

6:42:10 PM: ┌─────────────────────────────┐

6:42:10 PM: │ Netlify Build │

6:42:10 PM: └─────────────────────────────┘

6:42:10 PM: ​

6:42:10 PM: ❯ Version

6:42:10 PM: @netlify/build 3.3.5

6:42:10 PM: ​

6:42:10 PM: ❯ Flags

6:42:10 PM: deployId: 5f5743a29282d63ea3b08476

6:42:10 PM: mode: buildbot

6:42:10 PM: ​

6:42:10 PM: ❯ Current directory

6:42:10 PM: /opt/build/repo

6:42:10 PM: ​

6:42:10 PM: ❯ Config file

6:42:10 PM: No config file was defined: using default values.

6:42:10 PM: ​

6:42:10 PM: ❯ Context

6:42:10 PM: production

6:42:10 PM: ​

6:42:10 PM: ┌───────────────────────────────────┐

6:42:10 PM: │ 1. Build command from Netlify app │

6:42:10 PM: └───────────────────────────────────┘

6:42:10 PM: ​

6:42:10 PM: $ CI =npm run build

6:42:10 PM: bash: CI: command not found

6:42:10 PM: ​

6:42:10 PM: ┌─────────────────────────────┐

6:42:10 PM: │ “build.command” failed │

6:42:10 PM: └─────────────────────────────┘

6:42:10 PM: ​

6:42:10 PM: Error message

6:42:10 PM: Command failed with exit code 127: CI =npm run build

6:42:10 PM: ​

6:42:10 PM: Error location

6:42:10 PM: In Build command from Netlify app:

6:42:10 PM: CI =npm run build

6:42:10 PM: ​

6:42:10 PM: Resolved config

6:42:10 PM: build:

6:42:10 PM: command: CI =npm run build

6:42:10 PM: commandOrigin: ui

6:42:10 PM: publish: /opt/build/repo/build

6:42:10 PM: Caching artifacts

6:42:10 PM: Started saving node modules

6:42:10 PM: Finished saving node modules

6:42:10 PM: Started saving build plugins

6:42:10 PM: Finished saving build plugins

6:42:10 PM: Started saving pip cache

6:42:10 PM: Finished saving pip cache

6:42:10 PM: Started saving emacs cask dependencies

6:42:10 PM: Finished saving emacs cask dependencies

6:42:10 PM: Started saving maven dependencies

6:42:10 PM: Finished saving maven dependencies

6:42:10 PM: Started saving boot dependencies

6:42:10 PM: Finished saving boot dependencies

6:42:10 PM: Started saving go dependencies

6:42:10 PM: Finished saving go dependencies

6:42:13 PM: Error running command: Build script returned non-zero exit code: 1

6:42:13 PM: Failing build: Failed to build site

6:42:13 PM: Failed during stage ‘building site’: Build script returned non-zero exit code: 1

6:42:13 PM: Finished processing build request in 53.993847374s

Have you tried
CI= npm run build
rather than
CI =npm run build ?

I think this has a difference