Hi All, thank you @Stefan Schippers for your prompt response: I have already clone the https://github.com/barakhoffer/sky130_ngspice_reram (@Barak Hoffer) and I have

<http://sky130_fd_pr_reram__reram_module.va|sky130_fd_pr_reram__reram_module.va>

sky130_fd_pr_reram__reram_module.osdi

in the path /home/eda_work/eman/hassan/share/pdk/sky130B/libs.tech/ngspice. the current PDK_ROOT I added to the .bashrc are

export PDK_ROOT=/home/eda_work/eman/hassan/share/pdk