1-copy trees folder to /extension/
2-add lines inside "add_lines.txt" to /ext_config/ext_config.ini
3-rename "obj_trees.kn5" to "resp_obj_trees.kn5"
2-add lines inside "add_lines.txt" to /ext_config/ext_config.ini
3-rename "obj_trees.kn5" to "resp_obj_trees.kn5"