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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.
@Gordon
How are you using the SD card? Did you recompile your own version of Espruino? It's entirely likely that something is broken there and is causing Espruino to crash when it tried to load from the SD card...
Try holding down the blue button and resetting - that will start Espruino without loading the stored program.
If I were you I'd use the Web IDE to load the module into Espruino directly (write the require statement in the right-hand pane) and then you don't need an SD card at all.