Getting AttributeError when running gsutil

This just started happening today when I try to run `gsutil`:
```
Traceback (most recent call last):
File "/usr/lib64/google-cloud-sdk/bin/bootstrapping/gsutil.py", line 13, in
import bootstrapping
File "/usr/lib64/google-cloud-sdk/bin/bootstrapping/bootstrapping.py", line 32, in
import setup # pylint:disable=g-import-not-at-top
File "/usr/lib64/google-cloud-sdk/bin/bootstrapping/setup.py", line 66, in
DoAllRequiredChecks()
File "/usr/lib64/google-cloud-sdk/bin/bootstrapping/setup.py", line 62, in DoAllRequiredChecks
properties.VALUES.core.allow_py3.GetBool()):
AttributeError: '_SectionCore' object has no attribute 'allow_py3'
```
my version of python:
```
python --version
Python 2.7.5
```

gcloud version:
```
gcloud version
INFO: Display format "flattened[no-pad,separator=" "]".
Google Cloud SDK 238.0.0
alpha 2019.03.08
beta 2019.03.08
bq 2.0.42
bq-nix 2.0.42
core 2019.03.08
core-nix 2019.03.08
gcloud
gcloud-deps 2019.03.08
gcloud-deps-linux-x86_64 2019.03.08
gcloud-man-pages
gcloud-man-pages-nix 2019.03.08
gsutil 4.37
gsutil-nix 4.37
kubectl 2019.03.08
```

Any ideas what may be causing it?