Writing multiline command within other create an error??

Answer 1

basically the end of the comment within the comment causes the end of the outer comment to cause an error.
.
think of it as the following:
start
start
end
end
.
the first start creates a comment, the second start is commented out and thus ignored
the first end closes the comment and the compiler starts working on code.. it thinks the comment is code, and then it sees the end of a comment and gets an error

Answer 2

Thanks Daemo...Got it clear....