Can anyone tell me what's wrong with this code? I know it does nothing for now, but I don't understand the error message Cannot cast data of type string to string[] global proc editAttrPopup () { $currentObj = `ls -sl`; print($currentObj); string $currentAttrMin = ($currentObj + ".up_Filter_Size"); window -menuBar true -maximizeButton false -title "Edit_Attribute" -iconName "editAttrPopupI" -w 200 -h 150 PopEditAttrB_w; columnLayout; rowColumnLayout -numberOfRows 2; showWindow PopEditAttrB_w; } Thanks.