Welcome to the community, @shwetabijla have you validated your XLSForm through this online validator? The online validator should help you identify syntax issues if any present within your XLSForm.
Feel free to go through this post discussed previously (it should help you validate your XLSForm through the online validator):
When looking at your error message shared above, you may need to download your form as XLSForm and then check row 137 to see if the name is named properly. Feel free to share your XLSForm with the community if you are still not able to identify your issue. The community should be able to help you out.
