Applicant form has some fields like "Name", "Email" etc.

In the Enquiry form, I have inserted a lookup field (theName) and have set that to lookup "Name" as dropdown from "Applicant". I have added another field "test" to this form.

Now in Field Action>Name>On user input, I have entered the following code:

2. if (input.theName != null)
3. {
4. data = Applicant [ID == input.theName];
5. input.test = data.Email;
6. }

On saving the script, I am getting this error: 

Improper Statements/Expressions found 

java.lang.NullPointerException

What am I doing wrong and how do I correct it? The applicant for has 2-3 entries for testing purpose.