It's not recognizing the AT module (it mentions the SD card because, seeing the unrecognized module, checks if it can load it from an SD card) - Are you typing things into the left-hand side of IDE? Are you not connected to the internet?
For using modules, you need to "send to espruino" from the right-hand side - the IDE intercepts it, detects the modules that are needed, fetches them from espruino.com/modules/modulename.min.js, and sends that to the Espruino.
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
It's not recognizing the AT module (it mentions the SD card because, seeing the unrecognized module, checks if it can load it from an SD card) - Are you typing things into the left-hand side of IDE? Are you not connected to the internet?
For using modules, you need to "send to espruino" from the right-hand side - the IDE intercepts it, detects the modules that are needed, fetches them from espruino.com/modules/modulename.min.js, and sends that to the Espruino.