Related to Uipath Reframework exercise 2 - Generate Yearly report

When I execute the project - For few transaction item whole process (downloading -uploading report, updating the status in workitem and queue ) runs fine, for few it gives error - unable to find UIelements (while downloading the report, sometimes while saving the report).
I believe there is some issue in selectors. But my concern is - if there is issue in selector then why does it run for some transaction items.

Can anybody guide me on this?

My last program execution observation is as below -

For first transaction while downloading report, for November month, I had to manually click on download button then it completed the process.
For second and third transaction, the whole process ran successfully.
For 4th transaction - while downloading September month report, it gave exception -

Type file path: Could not find the UI element corresponding to this selector:
Search failed at selector tag:

The closest matches found are:

attach the xaml where actually you facing issue

System1_CreateYearlyReport.xaml (23.8 KB)
System1_UploadYearlyReport.xaml (21.5 KB)

@Veera_Raj - I have tested these files individually using test data, then it works fine.