PERFORM ANALYSIS command moved to after LOAD COMBINATION.
LOAD LIST 11 to 19 added before concrete design to restrict the concrete design to combinations only.
You should NOT do footing design in STAAD.Pro. This is not supported anymore. You need to use STAAD Foundation Advanced for that. I have commented out the footing design.
Also we do not recommend using such old versions of the product like STAAD.Pro 2006. You need to upgrade the software.
Modified file is attached for your reference(Please visit the site to view this file)