[Bug] initialize kepler demo-app with DuckDB plugin cause error on `_loadSampleData`

**Describe the bug**
When I initialize the demo-app with duckdb and uncomment the ```_loadPointData();``` function under the ```_loadSampleData()``` function. there error is

> Dataset error: Failed to create a new dataset:
> Error: Catalog Error: Type with name undefined does not exist!
> Did you mean "union"?

**To Reproduce**
Steps to reproduce the behavior:
1. Go to examples/demo-app/src/reducers/index.js
2. Line number 32, uncomment Initialize with duckdb
3. run the app
4. See error on loading data

**Expected behavior**
I want to load sampe points on application startup. without duckdb it is working fine but when I enable duckdb it gives me above error.