Cannot pass 'Add data' step

**System Information (please complete the following information):**
- Model Builder or CLI Version: Microsoft.ML.ModelBuilder.Gallery.Dev17-1.vsix on VS 2022
- Visual Studio Version (if applicable): 17.12.4

**Describe the bug**
- On which page of the tutorial did you run into an issue (URL): Add data
- Clear description of the problem: Once I selected yelp_labelled.txt as a data source (a file type ), it was loaded in Data Preview. However, 'Column to predict' was empty. I typed in 'col1' there. After that, 'Next step' button was stayed disabled - I could not proceed to the next step ("Advanced data options...' were disabled too).

**To Reproduce**
Steps to reproduce the behavior:
1. Go to 'Add Data'
2. Leave 'File' data source type selected
3. Click on 'Browse...' button
4. Navigate to and chose the downloaded and extracted file - yelp_labelled.txt
5. 'Data Preview' will show the first 10 rows of the file in two columns, with column names: 'col0' and 'col1'
6. Click to unfold 'Column to predict (Label)' - the drop down list is empty.
7. Type in 'col1' in the dropdown list entry box
8. 'Next step' button is disabled - cannot move further.

**Screenshots**
If applicable, add screenshots to help explain your problem.
**Additional context**
Add any other context about the problem here.

Tái hiện bước Add Data trong Model Builder bằng tệp yelp_labelled.txt và xác nhận rằng phần xem trước hiển thị col0 và col1. Kiểm tra điều khiển Column to predict và phần xác thực bật Next step; hoàn tất khi việc chọn col1 bật Next step và Advanced data options để tutorial có thể tiếp tục.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.