Ok...this is two in one day...but I swear there is a goblin wreaking havoc

with our bot/program.  



This error occurred when we downloaded a program to the brick and it

subsequently said that there is a "missing required file" and to reload the

software or nxt driver.  In nutshell, after reinstalling everything there is

to reinstall, including firmware, software, etc and rebooting and praying to

the Lego Gods for mercy after several hours of torture.  We still got the error.



Then we took our program to another computer and downloaded it to a

different brick.  Voila!  It happened again.  Ok..to shorten a very long

story....we have deduced that the particular robot program we were working

on is somehow corrupt (???).   What is really bizarre is that every other

program will give the same error if opened after the 'bad' program.  But! 

If we close down the NXT software and reopen a new program (without opening

the 'bad' program), it doesn't happen.



Anyone ever seen this before?  I can't find anything greyed out, nothing

looks obvious...but I am new at this, it's pretty easy to trip me up.   I

guess the kids will just have to rewrite the program?  But I am not

confident that another program will do the same thing.  



Thanks for your help - Paul Carder, The Lost Marbles



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