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Insufficiently constrained model problem

Insufficiently constrained model problem

Insufficiently constrained model problem

(OP)
Hello.
Solving a model y get that error in the last moment, no more errors, no warnings, and I don't know how to fix it.
The model is a little building only made whit SHELL63 elements.
Please help and thanks.
*** ERROR ***                           CP =      67.096   TIME= 23:46:56
 A small negative equation solver pivot term has been encountered at the
 UX degree of freedom of node 16076.  Check for an insufficiently        
 constrained model.           
____________________________________________________________

 S O L U T I O N   O P T I O N S

   PROBLEM DIMENSIONALITY. . . . . . . . . . . . .3-D                  
   DEGREES OF FREEDOM. . . . . . UX   UY   UZ   ROTX ROTY ROTZ
   ANALYSIS TYPE . . . . . . . . . . . . . . . . .STATIC (STEADY-STATE)
   GLOBALLY ASSEMBLED MATRIX . . . . . . . . . . .SYMMETRIC  

                      L O A D   S T E P   O P T I O N S

   LOAD STEP NUMBER. . . . . . . . . . . . . . . .     1
   TIME AT END OF THE LOAD STEP. . . . . . . . . .  1.0000    
   NUMBER OF SUBSTEPS. . . . . . . . . . . . . . .     1
   STEP CHANGE BOUNDARY CONDITIONS . . . . . . . .    NO
   INERTIA LOADS                        X           Y           Z
      ACEL . . . . . . . . . . . .  0.0000      9.8000      0.0000    
   PRINT OUTPUT CONTROLS . . . . . . . . . . . . .NO PRINTOUT
   DATABASE OUTPUT CONTROLS. . . . . . . . . . . .ALL DATA WRITTEN
                                                  FOR THE LAST SUBSTE

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