Autodesk Robot Structural Analysis

[#1]

When I run calculation I get en error saing "Seperate structure, do you want to countinuee?" and "Instability in node 1231 in direction RZ". When I look at the coulumne some of them does not fit properly (but the coordinates are correct), is this the problem mabye?

[#2]

If it is because of the columns is seperate, how do I fix it? the coordinates is correct.

[#3]

Try  to switch off display of sections and check if the bars 'meet' in the common nodes. Please look at http://forums.autodesk.com/t5/Autodesk-Robot-Structural/Instability-of-type-2/td-p/3340305 .

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