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I downloaded the new EV3 software from Lego and installed it on Windows 7. The EV3 software runs. I plugged in an NXT using a USB cable. EV3 can edit the memory on the NXT and remove programs/sounds/text files.

I created a program that uses the large motor to spin the B motor 1 rotation at 75% power. The end program block finishes the very small program.

It downloads without complaint. Run it and the NXT complains with "File error!".

Is this a known problem? Is there a fix?

The NXT has firmware 1.05 loaded.

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2 Answers 2

up vote 3 down vote accepted

I needed to update the firmware. 1.05 was too old. 1.31 works.

Download from: http://mindstorms.lego.com/en-us/support/files/default.aspx#Firmware

I did need to run the old NXT-G software to download the newer firmware. I did not try to download the firmware using EV3.

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First off Ev3 and Nxt are different machines. However, it's most likely the firmware. I've just downloaded my firmware for Ev3 and I also tried out a program I made. It downloaded perfectly but when I tried to start it, it said "FILE NAME ERROR", which I believe is similar to your problem. I either recommend re-downloading the firmware or turning the Ev3 or Nxt off then trying it again.

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I only have an NXT brick. The question concerned using EV3 software to create a program and download the program to an NXT brick. The NXT needed newer firmware. –  dfrevert Oct 17 '13 at 2:14
    
The NXT won't take programs from the EV3 programming environment! –  Timtech Oct 17 '13 at 15:12
    
Actually, the NXT does accept programs written in EV3-G. It did require a firmware upgrade. –  dfrevert Oct 22 '13 at 1:51
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