Mesh problem in X-lumped thermal model

I am trying to run the x-lumped thermal model coupled with DFN. I dont know but I am getting one mess problem.
var_pts = {
“x_n”: 4, # negative electrode
“x_s”: 4, # separator
“x_p”: 4, # positive electrode
“r_n”: 16, # negative particle
“r_p”: 16, # positive particle
“z”: 4
}
Please help me to fix this issue.