please someone should help me out with this error input file    
   Please help.
Program Version,EnergyPlus, Version 9.0.1-bb7ca4f0da, YMD=2019.03.05 20:57,
** Severe  ** <root>[Construction][Construction 1] - Missing required property 'outside_layer'.
**  Fatal  ** Errors occurred on processing input file. Preceding condition(s) cause termination.
...Summary of Errors that led to program termination:
..... Reference severe error count=1
..... Last severe error=<root>[Construction][Construction 1] - Missing required property 'outside_layer'.
************* Warning:  Node connection errors not checked - most system input has not been read (see previous warning).
************* Fatal error -- final processing.  Program exited before simulations began.  See previous error messages.
************* EnergyPlus Warmup Error Summary. During Warmup: 0 Warning; 0 Severe Errors.
************* EnergyPlus Sizing Error Summary. During Sizing: 0 Warning; 0 Severe Errors.
************* EnergyPlus Terminated--Fatal Error Detected. 0 Warning; 1 Severe Errors; Elapsed Time=00hr 00min  0.21sec
 Any ideas?
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