I want to call the full name and student id that the user already input from another screen. Please help me out.
You do not say when the error arises ?
The error is telling you that you are trying to get a list element from a list that is shorter than the index you are asking for. Use Do It in companion to check your work.
You are also probably not switching screens correctly.
TinyDB GetTags is a garbage pail.
You can't depend on position.
What are you using for tags?
use a constant text as tag, for example user to get all information of the current user
Clear TinyDB, correct your blocks accordingly and test
use Do it to debug your blocks, see also tip 4 here App Inventor: How to Learn | Pura Vida Apps
see also Live Development, Testing, and Debugging Tools
Taifun
Trying to push the limits! Snippets, Tutorials and Extensions from Pura Vida Apps by Taifun.