EnergyPlus EMS program line error

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Hi everyone, could someone help me with this error I`ve got in EMS in EnergyPlus?

** Severe  ** Problem found in EMS EnergyPlus Runtime Language.
**   ~~~   ** Erl program name: BLOCK1:ZONE1:WALL_1_WINDOW_1_CONTROL
**   ~~~   ** Erl program line number: 6
**   ~~~   ** Erl program line text: SET WIN_1_CONSTRUCTION = PCWINDOW_02
**   ~~~   ** Error message:  *** Error: EvaluateExpression: Variable = 'PCWINDOW_02' used in expression has not been initialized! *** 
**   ~~~   **  During Warmup, Environment=SITE (01-01:31-12), at Simulation time=01/01 00:00 - 00:15
**  Fatal  ** Previous EMS error caused program termination.
...Summary of Errors that led to program termination:
..... Reference severe error count=1
..... Last severe error=Problem found in EMS EnergyPlus Runtime Language.