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Dear All, I have a problem replacing blocks (titleblock) which is sometimes a dynamic block. When replacing blocks with a new one i get a lselsetp nil error when there is a dynamic block involved. What i try to do is the following: - I try to replace the block by finding it by name (so no manual selection is needed because of a script) - read the coordinates of the old block - read the scale of the old block - delete the block - purge all unused blocks in the drawing - insert the new one in the drawing at the right scale and coordinates The A0KILL does work for static blocks but someone used dynamic ones in our drawings. Now i have to do these blocks by hand for 15000 drawings. Can anyone help me with this issue? (Old blockname is OHTITLE the new one OH-TITLE) (DEFUN C:A0KILL() (setq OHINS (cdr (assoc 10 (entget (ssname (ssget "X" '((2 . "OHTITLE"))) 0))))) (setq OHX (cdr (assoc 41 (entget (ssname (ssget "X" '((2 . "OHTITLE"))) 0))))) (setq ss (ssget "X" '((0 . "INSERT")(2 . "OHTITLE")))) (command "_.erase" ss "") (repeat 3 (command "_.purge" "_B" "*" "_N") ) ; end repeat (command "-insert";Command "K:\\AutoCAD Standaard\\2014\\ALGEMEEN\\Kaders\\Titelh\\Nederlands\\A0\\OH-TITLE.DWG" ;Block Name OHINS OHX "" ) (setq OHINS nil) (setqoh OHX nil) (setq ss nil) )