AD material properties vs regular material properties

[rh201]

Hi all, when I run the code which contains block [[Modules/TensorMechanics/Master] [all]], there is an error as follows, do you ever occur the same/similar error and how to correct it? And what is the difference between AD material properties and regular material properties? Thank you.

*** ERROR ***
The requested AD material property mechanical_strain is declared as a regular material property. Either retrieve it as a regular material property with getMaterialProperty or declare it as an AD property wtih declareADProperty

[vanwdani]

I don't know exactly what your input file/code looks like, but I would guess you have enabled the AD system in some fashion. More about the AD: https://mooseframework.inl.gov/bison/automatic_differentiation/index.html

[rh201]

Thank you.