title: Code build is failed with Error while executing command: npm install. Reason: exit status 127
body: <p>I created a code pipeline with very simple code and connected to codecommit. tried to build it but it is failing at codebuild step stating error executing npm install. Am I missing something? Sorry I was new to this codebuild/ codepipeline.</p>
  <p>Below is the log for codebuild failure:</p>
  <pre><code>[Container] 2019/02/15 11:47:39 Waiting for agent ping 
  [Container] 2019/02/15 11:47:40 Waiting for DOWNLOAD_SOURCE 
  [Container] 2019/02/15 11:47:40 Phase is DOWNLOAD_SOURCE 
  [Container] 2019/02/15 11:47:40 CODEBUILD_SRC_DIR=/codebuild/output/src501317273/src 
  [Container] 2019/02/15 11:47:40 YAML location is /codebuild/output/src501317273/src/buildspec.yml 
  [Container] 2019/02/15 11:47:40 Processing environment variables 
  [Container] 2019/02/15 11:47:40 Moving to directory /codebuild/output/src501317273/src 
  [Container] 2019/02/15 11:47:40 Registering with agent 
  [Container] 2019/02/15 11:47:40 Phases found in YAML: 1 
  [Container] 2019/02/15 11:47:40 BUILD: 2 commands 
  [Container] 2019/02/15 11:47:40 Phase complete: DOWNLOAD_SOURCE Success: true 
  [Container] 2019/02/15 11:47:40 Phase context status code: Message: 
  [Container] 2019/02/15 11:47:40 Entering phase INSTALL 
  [Container] 2019/02/15 11:47:40 Phase complete: INSTALL Success: true 
  [Container] 2019/02/15 11:47:40 Phase context status code: Message: 
  [Container] 2019/02/15 11:47:40 Entering phase PRE_BUILD 
  [Container] 2019/02/15 11:47:40 Phase complete: PRE_BUILD Success: true 
  [Container] 2019/02/15 11:47:40 Phase context status code: Message: 
  [Container] 2019/02/15 11:47:41 Entering phase BUILD 
  [Container] 2019/02/15 11:47:41 Running command npm install 
  sh: 1: npm: not found 
  
  [Container] 2019/02/15 11:47:41 Command did not exit successfully npm install exit status 127 
  [Container] 2019/02/15 11:47:41 Phase complete: BUILD Success: false 
  [Container] 2019/02/15 11:47:41 Phase context status code: COMMAND_EXECUTION_ERROR Message: Error while executing command: npm install. Reason: exit status 127 
  [Container] 2019/02/15 11:47:41 Entering phase POST_BUILD 
  [Container] 2019/02/15 11:47:41 Phase complete: POST_BUILD Success: true 
  [Container] 2019/02/15 11:47:41 Phase context status code: Message: 
  [Container] 2019/02/15 11:47:41 Expanding base directory path: . 
  [Container] 2019/02/15 11:47:41 Assembling file list 
  [Container] 2019/02/15 11:47:41 Expanding . 
  [Container] 2019/02/15 11:47:41 Expanding artifact file paths for base directory . 
  [Container] 2019/02/15 11:47:41 Assembling file list 
  [Container] 2019/02/15 11:47:41 Expanding post-saml.yaml 
  [Container] 2019/02/15 11:47:41 Skipping invalid artifact path post-saml.yaml 
  [Container] 2019/02/15 11:47:41 Expanding beta.json 
  [Container] 2019/02/15 11:47:41 Found 1 file(s) 
  [Container] 2019/02/15 11:47:41 Phase complete: UPLOAD_ARTIFACTS Success: true 
  [Container] 2019/02/15 11:47:41 Phase context status code: Message: 
  </code></pre>
  <p>My buildspec.yml file looks like this:</p>
  <pre><code>version: 0.0
  environment_variables:
      plaintext:
          &quot;INPUT_FILE&quot;: &quot;serverless.yml&quot;
          &quot;S3_BUCKET&quot;: &quot;&quot;
  containers:
      LambdaFunctions:
          phases:
              during_build:
                  commands:
                      - npm install
                      - aws cloudformation package --template $INPUT_FILE --s3-bucket $S3_BUCKET --output-template post-saml.yaml
          artifacts:
              files:
                  - post-saml.yaml
                  - beta.json
  </code></pre>