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[EnergyPlus_Support] Fatal error: singular matrix in LU decomposition

   I'm doing a simulation with shading device on windows. After a few warnings
and fatal errors, the fatal error below appears. After launch the simulator,
when the CTF matrix are being calculated the fatal error appears. What means
this fatal error?

PS: I'm sending attached the idf file.

Program Version,EnergyPlus, 12/1/2005 11:01
   ************* Testing Individual Branch Integrity
   ************* All Branches passed integrity testing
   ************* Testing Individual Supply Air Path Integrity
   ************* All Supply Air Paths passed integrity testing
   ************* Testing Individual Return Air Path Integrity
   ************* All Return Air Paths passed integrity testing
   ************* No node connection errors were found.
   **  Fatal  ** Singular matrix in LUdecomposition, window calculations
   ************* EnergyPlus Terminated--Fatal Error Detected. 0 Warning; 0
Severe Errors

 Engº Fábyo Luiz Pereira
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