: Click Load . You should see a message saying "TLEN.lsp successfully loaded."

| Problem | Likely Cause | Solution | | :--- | :--- | :--- | | ; error: no function definition: VLAX-CURVE-GETENDPARAM | Visual LISP extension not loaded. | Type (vl-load-com) in command line, then retry. | | Total length is zero 0.00 | Selected objects have no length (e.g., points, text). | Use SSGET filter; ensure you didn't pick points or blocks. | | Command does nothing after typing TLEN | Routine loaded but not defined as a command. | Edit the LSP file. Change (defun TLEN to (defun C:TLEN . | | AutoCAD crashes on loading LSP | File is corrupted or contaminated with a virus. | Delete immediately. Scan your PC. Download from a new source. |