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when I try to launch xschem I get this error

Look in the `xschemrc` file. You might have to adjust the variables.

So how to adjust the variables please? <@U017X0NM2E7>

xschemrc

If you look at line 35 you will find USER_CONF_DIR which is related to the error

Right! Try defining it first.
```#### add ~/.xschem/xschem_library (USER_CONF_DIR is normally ~/.xschem)
set USER_CONF_DIR $::env(HOME)/.xschem
append XSCHEM_LIBRARY_PATH :$USER_CONF_DIR/xschem_library ```
Make sure there's a `~/.xschem/xschem_library` directory.

I've a hidden folder called .xschem but it's empty.

try `find ~/ -name xschem_library` to find your library path and then set the variable to that.

Maybe check your installation directories?

If I setup the PDK twice, may this cause a problem?

maybe `find $PDK_ROOT -name xschem_library` or `which xschem` and then search that the parent directory or its parent.

I thought that was empty. What does `which xschem` return?

I ran the command which xschem and it did not return something

That would seem to indicate that it is not installed. But you said you got an error message when you ran it.

When I run xschem without commands anywhere in the VM it is opened normally

When I run it after writing these commands (after
xschemrc is created), I have the error.
the commands are is the picture

```append XSCHEM_LIBRARY_PATH :$USER_CONF_DIR/xschem_library ```


```# append XSCHEM_LIBRARY_PATH :$USER_CONF_DIR/xschem_library```

Edit the file and add a `#` at the beginning of line 36.

Will I run this command in the terminal at home?

same window. I expect that you haven't set it yet.