JSF interface error when get infomation

JSF interface error when get infomation

I'm a beginner in jsf. i created an interface to get infomation from user.
When i submit infomation it has an error like this:
INFO: WARNING: FacesMessage(s) have been enqueued, but may not have been
displayed.
sourceId=j_idt7:j_idt11[severity=(ERROR 2), summary=(j_idt7:j_idt11:
Validation Error: Value is not valid), detail=(j_idt7:j_idt11: Validation
Error: Value is not valid)]
I tried to sovle it but i can't understand . How can i solve it, thank for
helping.