TypeError: config.TO_LANG.map is not a function (help)

[JohanArana13]

I am using the Optical Character Recognition feature of Google Vision API. I followed all the steps in the OCR Tutorial posted in Google. After uploading the image into the cloud bucket, I checked whether the image was successfully OCRed. However, there were no files on the RESULT_BUCKET. When I checked the function log, this showed:

How do I fix this error?

Edit:
After updating with the recent update, it was able to work.