While installing XSCHEM , i'm not able to see the symbols (shows missing symbol). What could be the problem here ?

Check your library path setting in

xschemrc

. Also asking on #xschem usually gets a quick response from @Stefan Schippers

@Aditya this is the welcome screen of xschem used as standalone (no sky130 libs). Start xschem from a directory with no xschemrc file. Xschem has a default setting for its search path to enable viewing the examples. How did you install xschem? From the xschem git repository? using some docker container?