backslash and newline separated by space

I received this error message. What does it mean? (other than the obvious)

Also, I don’t see how you can search this forum

It means that something in the code you didn't post is incorrect.

Search is up there, on the right.

Do you have any '\n' in your code? You might have typed '\ n'.

I suspect that there's a backslash at the end of a line (perhaps in a macro definition continued on the next line) but instead of being immediately followed by a newline, it has a space and then a newline.
This:

\

instead of this:

\

Just hit "Select" to see what is highlighted in the two versions.

Pete