VaraiblesDevice Error getting attribute value temp.variable: Could not parse expression

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Hello,
I am trying to configure a VariablesDevice but I get the error

"Error getting attribute value temp.variable: Could not parse expression"
pimatic version 0.9.38#

entry in the devices section of the config.json:

 "devices": [
    {
      "variables": [
        {
          "name": "variable",
          "expression": "$variable",
          "type": "number",
          "unit": "°C"
        }
      ],
      "xAttributeOptions": [],
      "id": "temp",
      "name": "temp",
      "class": "VariablesDevice"
    }
  ],
  "rules": [],
  "pages": [
    {
      "id": "favourite",
      "name": "Favourites",
      "devices": []
    }
  ],

Can anyone help me?

@schartei said in VaraiblesDevice Error getting attribute value temp.variable: Could not parse expression:

“expression”: “$variable”,

What are you trying to achieve? The variable reference $variable does not look right unless you have defined a variable with that name.

Iwould like to send a temperaturvalue every 5 min via esp8266