bad charecter used 0

#1: I am not sure what I am doing wrong now can some one please tell me in very simple terms what I need to do if there is a simple way to fix a 0 character error when I try to run a .DXF file I tried to fix it using librecad but it way over my head still

#2: when I get this to run with you great people out there's help how will I get it adjusted for each piece and the thickness of those piece"s so I can cut them out of some wood to make a full ghost house and others like it, I have a led light show I would like to install in them and others like it to make a small diorama

below is some picture of what I trying to explain

The error normally arises from a O character being where a 0 should be ( character O instead of zero)

You need to start at the beginning - you cannot 'run' a DXF file,
what changes have you made to your ini file that lead you to believe that you can?

dxf2gcode filter?

If that is the case, first step is probably to run the .DXF file through dxf2gcode manually and examine the resulting .ngc file,
searching for an 'O'

you need to convert your dxf file to gcode first , using a cam program such as cambam or vetric aspire .
or any of the freeware ones available