May you help me to understand following warnings, please?

edit

Error file:

Program Version,EnergyPlus, Version 8.5.0-c87e61b44b, YMD=2019.01.21 17:02,IDD_Version 8.5.0
************* Beginning Zone Sizing Calculations
** Warning ** Weather file location will be used rather than entered (IDF) Location object.
**   ~~~   ** ..Location object=ATLANTA-HARTSFIELD.JACKSON.INTL.AP_GA_USA WMO=722190
**   ~~~   ** ..Weather File Location=DAEJEON - KOR IWEC2 WMO#=471330
**   ~~~   ** ..due to location differences, Latitude difference=[2.73] degrees, Longitude difference=[211.80] degrees.
**   ~~~   ** ..Time Zone difference=[14.0] hour(s), Elevation difference=[77.00] percent, [241.00] meters.
** Warning ** CheckUsedConstructions: There are 121 nominally unused constructions in input.
**   ~~~   ** For explicit details on each unused construction, use Output:Diagnostics,DisplayExtraWarnings;
** Warning ** ManageSizing: For a system sizing run, there must be at least 1 Sizing:System object input. SimulationControl System Sizing option ignored.
************* Beginning Plant Sizing Calculations
** Severe  ** For autosizing of Branch AIRLOOP G SW MAIN BRANCH, a system sizing run must be done.
**   ~~~   ** No "Sizing:System" objects were entered.
**  Fatal  ** Program terminates due to previously shown condition(s).
...Summary of Errors that led to program termination:
..... Reference severe error count=1
..... Last severe error=For autosizing of Branch AIRLOOP G SW MAIN BRANCH, a system sizing run must be done.
************* 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.
*************
************* ===== Final Error Summary =====
************* The following error categories occurred.  Consider correcting or noting.
************* Nominally Unused Constructions
************* ..The nominally unused constructions warning is provided to alert you to potential conditions that can cause
************* ..extra time during simulation. Each construction is calculated by the algorithm indicated in the HeatBalanceAlgorithm
************* ..object. You may remove the constructions indicated (when you use the DisplayExtraWarnings option).
*************
************* EnergyPlus Warmup Error Summary. During Warmup: 0 Warning; 0 Severe Errors.
************* EnergyPlus Sizing Error Summary. During Sizing: 3 Warning; 0 Severe Errors.
************* EnergyPlus Terminated--Fatal Error Detected. 3 Warning; 1 Severe Errors; Elapsed Time=00hr 00min 28.97sec