Report not compiling, probably dumb goof

This is a "it used to work!" problem.  This report compiled to a .ps 
just fine back in December.  I got busy with other things, then today 
tried running Lout on this again.  Now it gives errors

bash> lout tmp.lt > tmp.ps
lout file "tmp.lt":
     13,1: symbol @BeginSections unknown or misspelt
     15,1: unresolved cross reference @SectionList&&10.694.tmp.1
     15,1: unresolved cross reference @SectionList&&10.694.tmp.1
     15,1: unresolved cross reference @SectionList&&10.694.tmp.1
     15,1: unresolved cross reference @SectionList&&10.694.tmp.1
     21,1: symbol @EndSections unknown or misspelt
     13,1: fatal error: no current font at word @BeginSections

Of course, I didn't change anything, update Lout, or even breathe upon 
this project.  I'm using Lout 3.39 on a Linux 64-bit machine.

What follows is a greatly cut-down version of the report giving the same 
errors as the original.   The line numbers in the above errors refer to 
this cut-down version.  I have probably accidentally deleted a line or 
inserted a stray character.  What doofus mistake did I make?

BTW, I checked the slides in "Practical Introduction" and found only 
that @Abstract is shown after the // but I have it before.  If I put it 
after, Lout isn't happy.   I assume it should go before, and the slide 
is for an older less picky version of Lout.   Is that true?  But this 
seems to have nothing to do with my main question.

==== tmp.lt ====

@SysInclude {report}
@Report
@Title {Generalized Title}
@Author {Daren Scot Wilson}
@Institution {Podunk Univ.}
@DateLine {Yes}
@AbstractDisplay {Yes}
@Abstract { The familiar further exploration.
Whatever @B TeX for something stuff.
}
//

@BeginSections

@Section @Title {Motivation}
@Begin
@PP
When I was young something blah blah etc.
@End @Section

@EndSections


==== mydefs file =====

(doesn't matter. contents deleted, get same error)

==== END ====

-- 
Daren Scot Wilson
Escondido California
[email protected]
http://www.darenscotwilson.com
http://www.jeffcottwilson.com