UTF-8 codec can't decode byte - Python 3.6 / Superset 1.8

[jerryhall]

I was having UTF-8 encoding issues with my python 2.7 install so I upgraded to 3.6. Now I can't view any of my datatables or slices but, instead get this stacktrace:

Was any guide published to help Superset users upgrade? I haven't been able to find any.

Any help would be appreciated.
Traceback (most recent call last):
File "/home/ec2-user/.pyenv/versions/3.6.0/lib/python3.6/site-packages/flask/app.py", line 1982, in wsgi_app
response = self.full_dispatch_request()
File "/home/ec2-user/.pyenv/versions/3.6.0/lib/python3.6/site-packages/flask/app.py", line 1614, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/home/ec2-user/.pyenv/versions/3.6.0/lib/python3.6/site-packages/flask/app.py", line 1517, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "/home/ec2-user/.pyenv/versions/3.6.0/lib/python3.6/site-packages/flask/compat.py", line 33, in reraise
raise value
File "/home/ec2-user/.pyenv/versions/3.6.0/lib/python3.6/site-packages/flask/app.py", line 1612, in full_dispatch_request
rv = self.dispatch_request()
File "/home/ec2-user/.pyenv/versions/3.6.0/lib/python3.6/site-packages/flask/app.py", line 1598, in dispatch_request
return self.view_functionsrule.endpoint
File "/home/ec2-user/.pyenv/versions/3.6.0/lib/python3.6/site-packages/superset/utils.py", line 574, in wraps
return f(self, *args, **kwargs)
File "/home/ec2-user/.pyenv/versions/3.6.0/lib/python3.6/site-packages/superset/views/core.py", line 1672, in dashboard
if datasource and not self.datasource_access(datasource):
File "/home/ec2-user/.pyenv/versions/3.6.0/lib/python3.6/site-packages/superset/views/base.py", line 94, in datasource_access
self.schema_access(datasource, user=user) or
File "/home/ec2-user/.pyenv/versions/3.6.0/lib/python3.6/site-packages/superset/views/base.py", line 87, in schema_access
self.database_access(datasource.database, user=user) or
File "/home/ec2-user/.pyenv/versions/3.6.0/lib/python3.6/site-packages/sqlalchemy/orm/attributes.py", line 237, in get
return self.impl.get(instance_state(instance), dict)
File "/home/ec2-user/.pyenv/versions/3.6.0/lib/python3.6/site-packages/sqlalchemy/orm/attributes.py", line 584, in get
value = self.callable_(state, passive)
File "/home/ec2-user/.pyenv/versions/3.6.0/lib/python3.6/site-packages/sqlalchemy/orm/strategies.py", line 557, in _load_for_state
return self._emit_lazyload(session, state, ident_key, passive)
File "", line 1, in
File "/home/ec2-user/.pyenv/versions/3.6.0/lib/python3.6/site-packages/sqlalchemy/orm/strategies.py", line 603, in _emit_lazyload
return loading.load_on_ident(q, ident_key)
File "/home/ec2-user/.pyenv/versions/3.6.0/lib/python3.6/site-packages/sqlalchemy/orm/loading.py", line 223, in load_on_ident
return q.one()
File "/home/ec2-user/.pyenv/versions/3.6.0/lib/python3.6/site-packages/sqlalchemy/orm/query.py", line 2814, in one
ret = self.one_or_none()
File "/home/ec2-user/.pyenv/versions/3.6.0/lib/python3.6/site-packages/sqlalchemy/orm/query.py", line 2784, in one_or_none
ret = list(self)
File "/home/ec2-user/.pyenv/versions/3.6.0/lib/python3.6/site-packages/sqlalchemy/orm/loading.py", line 90, in instances
util.raise_from_cause(err)
File "/home/ec2-user/.pyenv/versions/3.6.0/lib/python3.6/site-packages/sqlalchemy/util/compat.py", line 203, in raise_from_cause
reraise(type(exception), exception, tb=exc_tb, cause=cause)
File "/home/ec2-user/.pyenv/versions/3.6.0/lib/python3.6/site-packages/sqlalchemy/util/compat.py", line 187, in reraise
raise value
File "/home/ec2-user/.pyenv/versions/3.6.0/lib/python3.6/site-packages/sqlalchemy/orm/loading.py", line 75, in instances
rows = [proc(row) for row in fetch]
File "/home/ec2-user/.pyenv/versions/3.6.0/lib/python3.6/site-packages/sqlalchemy/orm/loading.py", line 75, in
rows = [proc(row) for row in fetch]
File "/home/ec2-user/.pyenv/versions/3.6.0/lib/python3.6/site-packages/sqlalchemy/orm/loading.py", line 437, in _instance
loaded_instance, populate_existing, populators)
File "/home/ec2-user/.pyenv/versions/3.6.0/lib/python3.6/site-packages/sqlalchemy/orm/loading.py", line 498, in populate_full
dict[key] = getter(row)
File "/home/ec2-user/.pyenv/versions/3.6.0/lib/python3.6/site-packages/sqlalchemy/sql/type_api.py", line 1122, in process
return process_value(impl_processor(value), dialect)
File "/home/ec2-user/.pyenv/versions/3.6.0/lib/python3.6/site-packages/sqlalchemy_utils/types/encrypted.py", line 261, in process_result_value
decrypted_value = self.engine.decrypt(value)
File "/home/ec2-user/.pyenv/versions/3.6.0/lib/python3.6/site-packages/sqlalchemy_utils/types/encrypted.py", line 89, in decrypt
decrypted = decrypted.decode('utf-8')
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xf1 in position 4: invalid continuation byte

[xrmx]

Duplicate of #2600, please close.
See #2600 (comment)