How can you fix error 5011 in Lego Mindstorms 2.0 software?

I have experienced the same problem; it happens sometimes when copying and pasting blocks, that the flow logic is damaged. Look to see if the LEGO pieces that you put the blocks on is not continuous. It is a serious problem with the software that needs a fix. As it is, I do not recommend copying and pasting more than a block at a time. Keep lots of versions of your program so you can revert to an older saved version if you corrupt your file. If you do not have an older version, you may be forced to rewrite your program completely