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@mohammadreza All you did was load the file. You have to type (get_baseboardserialnumber) with the parenthesis at the command line to RUN the function. I suggest you start learning about the basics of AutoLISP / Visual LISP and customization. Look at some tutorials on Autodesk help, YouTube or google "AutoLISP programming basics" to get you started. Also check out some of LeeMac's tutorials: http://www.lee-mac.com/tutorials.html#lisptutorials

FYI... ChatGBT does not do lisp well. it can sometimes get you close but I have found personally a 85% failure rate. It makes up functions. Sometimes it's funny what it calls them... Sometimes it fills enough gaps so that if you know lisp you can fill in the needed parts. I do hope it gets better...