gloomyandy wrote:It means what it says you have not copied a jre file to your SD card. What JRE did you select? Please make sure you select a Java 7 JRE not a Java 8 JRE, Java 8 is not currently supported by leJOS.
oh, so I know the probleam, I select jre 8... thank you for your answer
You need a JRE for the EV3, the link you are trying to use is a JDK for Windows. You can download the JRE from here: http://java.com/legomindstorms note that you need the Java 7 JRE not the Java 8 JDK from this page. The .gz file that you download needs to be copied to the FAT32 SD card either manually (if on Linux/MacOs) or using the instaler (Windows).
Did you follow my instructions given above to download the JRE for ARM? What was the file you ended up selecting in the second stage (the one you select using the JRE button)? Please provide the full file name.