Hello, I was part of the physical verification sky130 workshop. I'm trying to redo Lab 1, but I'm having trouble with xschem. Every time I try to run it, I get this message: Tcl_AppInit() error: can not execute /home/nicole/Lab1/xschem/xschemrc, please fix: can't read "USER_CONF_DIR": no such variable. I'm not sure what's going wrong. I tried googling this message, but I haven't found anything relevant. Does anyone have any suggestions on how to fix this?