While simulating on xschem i get the following error”Could not find include file ~/skywater-pdk/libraries/sky130_fd_pr_ngspice/latest/cells/nfet_01v8/sky130_fd_pr__nfet__01v8__tt.corner.spice”. Which step did i probably miss? how do rectify this ?

@Surag P edit the xschemrc file, find the line at the bottom: set SKYWATER_MODELS .... and set the correct path. Replace ~ with /home/user, just to eliminate any ambiguity. Next verify if in your skywater-pdk installation the above mentioned file exists. the skywater-pdk spice models need to be patched , it is explained in the video at 14'40". If you have problems looking at the video there is a version.

@Stefan Schippers Thanks a lot!!! Replacing ~ with /home/user was enough, i had already patched spice models.