Required namespace "goog.events.EventWrapper" never defined.

[Brijeshlakkad]

Expected Behavior

python build.py should generate blockly and block compressed and uncompressed files

Actual Behavior

@MacBook-Air scratch-blocks % python build.py
The compiler is waiting for input via stdin.
Using remote compiler: closure-compiler.appspot.com ...

SUCCESS: blockly_uncompressed_horizontal.js
SUCCESS: blockly_uncompressed_vertical.js
FATAL ERROR
Required namespace "goog.events.EventWrapper" never defined.
??? at line 55:
goog.requireType('goog.events.EventWrapper');
^

Steps to Reproduce

closure-library: google-closure-library@20180204.0.0 (at project root)
google-closure-compiler: 20180402.0.0
google-closure-library: 20180204.0.0
chromedriver: ^81.0.0

Operating System and Browser

Mac OS 10.15.4
Chrome 83.0.4103.116