1.Login to Azure
2.Select company:LONG For HSPL
3.Navigate to Home >> Company Home >> IRS Reports
4.Add new IRS report.
5.Select Type as 'W2 Report'.
6.Provide report name
7.Select Cost Calculation Basis as 'Pro-rated'
8.Consider Plan with 'Prorated'
9.Select all employee fields and benefit related fields
10.Click on preview.

Actual result: Getting server error
Expected result: Report should be generated properly.

Please refer attached scrren shot and error log