I have a LEGO Mindstorms EV3 program that I was working on for a long time but recently and suddenly when I try to download the program the software displays the following message:

"unable to compile some documents for deployment"

Taking in to consideration that there is no missing blocks and the sensors ports are adjusted correctly and checked many times. What is the main cause of this and how can this be fixed?

  • that happend to me to but i tried everything but nothing works for all you people out there try deleting the lego mindstorms it self then redownloading it – superlego Apr 6 '17 at 17:47

Is that the whole error message or are there more lines to it?

You could always try copying and pasting your project pieces into a new project, hoping that the project file itself got corrupted in some way.

It also might be possible that some of your custom blocks have errors in them.

If none of these work for you, then try to isolate the source of the error - remove parts of the program and check if the error is still there. If the error goes away after removing a block, then that one is the source of the error, you should looking into more closely to find the issue.


If You are using Custom "My-blocks", try copying their content, deleting the block, then pasting it into another tab and re-make it. Hope I helped :)

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