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This error occurs when the calculated cooling supply air temperature is too close to the zone's air temperature (in this case, within 2 deg C). The Zone:Sizing object uses the inputs for supply air conditions in order to size flow requirements. Your two error messages show the change in setting cooling design supply air temp from 12.8 C to 34.6 C, but the thermostat set point temperature is 0 deg C for both! You said that you are using the Template Thermostat object, so I'm guessing something is wrong with that. Some things to check:

• Did you happen to enter the value 24 on the "Cooling Setpoint Schedule Name" field instead of the "Constant Cooling Setpoint" field?
• The Template Thermostat object can only be referenced by specific Zone HVAC Template objects. Make sure your unitary system template object matches the list on the Template Thermostat Input / Output Reference page I made a link to above.
• Make sure that the unitary system template object is connected to the zone L1_GUEST_LOUNGE correctly