Traceback (most recent call last):

  File "../../third_party/dom_distiller_js/protoc_plugins/json_values_converter.py", line 14, in <module>

    from util import plugin_protos, types, writer

  File "/home/pkgmk/work/chromium/src/chromium-62.0.3202.75/third_party/dom_distiller_js/protoc_plugins/util/plugin_protos.py", line 22, in <module>

    from google.protobuf.descriptor_pb2 import FieldDescriptorProto

ImportError: No module named protobuf.descriptor_pb2

--plugin_out: protoc-gen-plugin: Plugin failed with status code 1.

Protoc has returned non-zero status: 1 .

ninja: build stopped: subcommand failed.

=======> ERROR: Building '/home/pkgmk/pkg/chromium#62.0.3202.75-1.pkg.tar.xz' failed.

Any ideas what's causing this? Thanks.