Sorry sushi...I can only simpatize...I had a similar problem with two designs ...the janome 350e was getting crazy when I connected the USB stating that " there is not enough memory...." ..... It was so ennoying...I had arased all the other designs from the USB and was still getting the same message.....I even bough a new USB...and nothing....
Next time I had the same problem I just did send the file to the embrilliance support and they were wonderful....she did send me a foto showing me how exactlly my design was too big for my hoop.....
As it came out The hoop that I had picked up for the design, was incorrect...... They even recomended me which hoop to use for this design.... And it worked !!!!...... .... .....if I were you, I would put this design aside for few days.....and do something else......sometimes it help to get away from something that causes problems...... ....Good luck....