Error -Value missing for Leave Application: Employee

Hi, I am using Erpnext version-13-beta. I created users and assigned them to permissions there without any customized code of Erpnext core. There is one user, I logged in from this user and create a leave application but I am getting this “Error -Value missing for Leave Application: Employee”. but when I am doing log in from another user then They can create a leave application without getting any barrier. I don’t know, why I am getting this error only for this single user.