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Where I can refer to 'unique key name'?

I am new to EMS. So this may be quite fundamental problem.
When I try to use EMS to change chiller performance curve according to outdoor air temperature, I got following error.

    ** Severe  ** Invalid Output:Variable or Output:Meter Index Key Name =
   **   ~~~   ** For Output:Variable or Output:Meter = CHILLER EVAPORATOR OUTLET TEMPERATURE
   **   ~~~   ** Entered in EnergyManagementSystem:Sensor=CHWT
   **   ~~~   ** Unique Key Name not found.

I guess this is because EnergyPlus cannot find specific chiller since I implement multiple chillers. However, I cannot find where I should look at to find this unique key name.

Can anyone tell me where I can find these information?

Thank you.

Where I can refer to 'unique key name'?

I am new to EMS. So this may be quite fundamental problem.
When I try to use EMS to change chiller performance curve according to outdoor air temperature, I got following error.

    ** Severe  ** Invalid Output:Variable or Output:Meter Index Key Name =
   **   ~~~   ** For Output:Variable or Output:Meter = CHILLER EVAPORATOR OUTLET TEMPERATURE
   **   ~~~   ** Entered in EnergyManagementSystem:Sensor=CHWT
   **   ~~~   ** Unique Key Name not found.

I guess this is because EnergyPlus cannot find specific chiller since I implement multiple chillers. However, I cannot find where I should look at to find this unique key name.

Can anyone tell me where I can find these information?

Thank you.