Hey,
I'm new in this software, and i'm doing a app to show the values of temperature, humidity and luminosity. I get the values from a dht11 sensor and these values are published in MQTT Explorer. I have the extension to get the values, but i'm having trouble in the graph building. In attachment i have my layout, blocks, and error message.
Thanks for your help and a happy new year!
![AppLayout](https://community.appinventor.mit.edu/uploads/default/original/3X/8/a/8abaed8c916eb78203678739c2abb66f5d89af11.png)