When I am using a field variable for Clay Plasticity in ABAQUS-2020 to define stress ratio parameter according to the field variable and USDFLD, I faced an error saying "The independent variables must be arranged in ascending order", while it is in ascending order. I have tested it for Elastic modulus and it works fine, but for Clay Plasticity material parameters it didn't work. I attached the simple model. I appreciate it if you could help me?