[Seaside] Following seaside tutorial get: Error: RemoteString past end of file

[Tim M]

I am following the Hasso Platner seaside tutorial and have got to the part 
about forms - and when I try to create a new task (e.g. click on the link 
I created to create a new task), I get an Error: RemoteString past end of 
file in my browser.

I don't understand this - previously mistakes I have made have given proper 
stacktraces in the browser that I could then debug, but this is a raw tex 
error in the browser. If I try and put a self halt in the place where I think 
the error occurs, I just hang my image if I try and debug (I am using windows, 
and Damions 3.10 web image).

What's going on? 

Tim

Error: RemoteString past end of file
RemoteString>>text
CompiledMethod>>getSourceFromFile
CompiledMethod>>methodNode
MethodContext(ContextPart)>>methodNode
MethodContext(ContextPart)>>tempNames
[] in WAWalkback>>renderStackFrame:on: {[self renderObject: aContext labelled: 
'thisContext' on: html. self ...]}
BlockContext>>renderOn:
[] in WAGenericTag(WATagBrush)>>with: {[self before. anObject renderOn: canvas. 
self after]}
BlockContext>>renderOn:
WARenderCanvas(WACanvas)>>nest:
WAGenericTag(WABrush)>>with:
WAGenericTag(WATagBrush)>>with:
WARenderCanvas(WAHtmlCanvas)>>definitionList:
WAWalkback>>renderStackFrame:on:
[] in WAWalkback>>renderStackOn: {[self renderStackFrame: each on: html]}
BlockContext>>renderOn:
[] in WAGenericTag(WATagBrush)>>with: {[self before. anObject renderOn: canvas. 
self after]}
BlockContext>>renderOn:
WARenderCanvas(WACanvas)>>nest:
WAGenericTag(WABrush)>>with: