Unable to create calculated item with agent2 mqtt argument in formula

[Alex7788]

Hello. Please, help me.

1 item - prsColdWater. Agent active, mqtt.get

2 item. Calculated. Formula: max(/mqttListner/prsColdWater, 1m)

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2 - not working. Error:

• Cannot evaluate function: item "/mqttListner/prsColdWater" does not exist at "max(/mqttListner/prsColdWater, 1m)".