You can go through the following post for more details --
communities.bentley.com/.../staad-pro-instability-and-zero-stiffness-faq
If the problem is model specific, you can upload your STAAD.Pro model.
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RE: How to resolve error in staadpro such as *WARNING- ZERO STIFFNESS IN DIRECTION 2 AT JOINT 482 EQN.NO. 2780
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