If you are seeing this message, check these three critical areas first: The "First Line" Rule STAAD input file must start with the word followed by the structure type. Correct examples STAAD SPACE STAAD PLANE STAAD TRUSS If there is a blank line or a comment (lines starting with
Your next step? Open your current project file right now, check its first line, and save a clean ASCII backup. You will thank yourself when the error inevitably appears on a Friday at 4:55 PM. This Is Not A Valid Staad Command File