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I tried to implement a continuous integration system on my VPS. I have a PHP script that runs ng build. However in my default PHP configuration no environment variable HOME or USERPROFILE was set. I had this error : `Path must be a string. Received undefined`. I had to take some time to see where the problem came from so I made a pull request to clarify the error. Now it is : `Error: Missing environment variable HOME` which does not require to look at the code. This message would have saved me some time.