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SAP2000 INTERNAL ERROR DETECTED

SAP2000 INTERNAL ERROR DETECTED

SAP2000 INTERNAL ERROR DETECTED

(OP)
Can anyone help me understand what this error means?  

I am adjusting the stiffness modifiers and shell types within a large model.  When I make the same changes in a small model, I do not get these errors.  Thank you!

* * * E R R O R * * *                                                          
 INTERNAL PROGRAM ERROR DETECTED.  PLEASE RECORD THE FOLLOWING INFORMATION:     
 VALUES  =           5     .000000                                              
 MESSAGE = SapFire_SolveForwBackSfire2SBR: Could not solve load vectors         
                                                                                
 IMMEDIATELY FATAL ERROR - ANALYSIS TERMINATED                                  
                                                                                
 * * * W A R N I N G * * *                                                      
 INTERNAL PROGRAM ERROR DETECTED.  PLEASE RECORD THE FOLLOWING INFORMATION:     
 VALUES  =           5     .000000                                              
 MESSAGE = Stiff_ForwSBR: Sparse solution for loads failed                      
                                                                                
 IMMEDIATELY FATAL ERROR - ANALYSIS TERMINATED    

RE: SAP2000 INTERNAL ERROR DETECTED

Under the Analysis options, try changing from default Advanced solver to standard solver which gives better error messaging

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