Javascript Error in DroneBlocks Code

My class has been using DroneBlocks Code for a couple of weeks now, and for some reason today 3 of my students had the following error pop up.

Two of the students were able to keep working despite the message, but the third couldn’t connect to the Tello with that error message going.

Has anyone else suffered this error? Any suggestions?

Did you go through the following process:

  1. Power up Tello

  2. Connect to Tello’s network

  3. After connection is made click Connect in DroneBlocks Code

That error leads me to believe something is already connected to Tello or perhaps the firmware is out of date? Was this being done on Mac or PC? Let us know and we can dive in further.