Water heater tank set point temperature

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Happy day to all of you; I recently started working on E+ program, my project is to design a hybrid cooling system for a single room, I encountered an error, and I do not know what the reason is, I checked all the data, but everything is correct, please help me.

   ** Severe  ** Chilled Water Tank = CHILLED WATER STORAGE TANK 1:  Water heater tank set point temperature is lower than the minimum tank temperature limit.
   **   ~~~   ** Chilled water tank set point temperature is reset to Tank Temperature Limit plus 1 C (2.00) and simulation continues.
** Severe  ** Chilled Water Tank = CHILLED WATER STORAGE TANK 1:  Water heater tank set point temperature is lower than the minimum tank temperature limit.
   **   ~~~   ** Chilled water tank set point temperature is reset to Tank Temperature Limit plus 1 C (2.00) and simulation continues.

Any help would be greatly appreciated. Thank you. SILVANA