The manual provides extensive guidance on initial stress generation. It explains the difference between the $K_0$ procedure and Gravity Loading.
This is the dry, technical document you refer to when you forget what a specific input parameter means. plaxis manual
If the calculation stops prematurely, the **Scientific The manual provides extensive guidance on initial stress
A step-by-step guide that walks beginners through practical examples, such as footing settlements and excavation stability. Reference Manual: plaxis manual