SSO>TexasLife>Server error is displaying after redirecting to WorkTerra

Env - Stage
Company under test - Symphony for HSPL

1] Login as a employee to the application.
2] While traversing New Hire flow, click on "Enroll" button for TexasLife plan.
3] Employee gets redirected to TexasLife Window.
4] Click on NEXT button on second page.
5] Click on "Continue Election" button on second page.

Actual Result:
Employee redirects to Workterra and server error is displayed.
Expected Result:
Server error should not be display.
Refer attached screenshot and error log for more details.

Cc: Jaideep Vinchurkar, Santosh Balid, Prasad Pise, Samir, WT-Admin