Error 507 in my program bloc

I'm doing a project in class and my interface doesn't work .He said me about a problem and i don't know where and what can be the problem.

507 = Unable to connect

That's interesting Rafael. There is a lot we need to know in order to help:

  1. Device Make, Model & Version - both sending and receiving devices, e.g. Smartphone and Microcontroller (Arduino?).

  2. Make, Model & Version of any hardware ad-ons e.g. Bluetooth Module (e.g.HC-05).

  3. Right-mouse in the blocks work area and select "Download Blocks as Image". Upload here.

  4. Also upload your script/sketch file for the microcontroller.

Is there a tutor in your class that can check that your electronics are correctly wired and have an adequate source of power?