3D MOSFET model

I am trying to simulate 3d mosfet model. I have applied all boundary and initial conditions to the 3D model. I have used a swept mesh for domain 2.

But in the solver i am getting an error

Undefined value found.
- Detail: Undefined value found in the equation residual vector.
There are 727 degrees of freedom giving NaN/Inf in the vector for the variable comp1.Ne.
at coordinates: (2.20179e-008,5.25e-007,7.70846e-007), (6.63152e-008,5.25e-007,8.12566e-007), (2.21487e-008,3.75e-007,8.12527e-007), (6.61844e-008,3.75e-007,7.70885e-007), (4.41665e-008,4.5e-007,7.91706e-007), ...
There are 728 degrees of freedom giving NaN/Inf in the vector for the variable comp1.Ph.
at coordinates: (2.22271e-008,5.25e-007,9.37527e-007), (2.22271e-008,5.25e-007,8.95861e-007), (6.6233e-008,5.25e-007,9.79194e-007), (2.20029e-008,3.75e-007,9.79167e-007), (6.64571e-008,3.75e-007,9.37554e-007), ...
There are 2 degrees of freedom giving NaN/Inf in the vector for the variable comp1.V.
at coordinates: (3.63886e-007,7.80064e-007,4.80733e-007), (3.85843e-007,7.05064e-007,4.80733e-007), ...

Please, can someone help me out? I have attached my file below.

Thank You.