Redstore support for SPAQL 1.1 Update

I have downloaded Redstor and installed and run on Mac OS X

On the query web page I have selected:

Query Language: SPARQL 1.1 Query and Update Languages.

I have then entered the following Update statement

PREFIX dc: <http://purl.org/dc/elements/1.1/>
INSERT DATA
{ 
  <http://example/book1> dc:title "A new book" ;
                         dc:creator "A.N.Other" .
}

When submitted I get an error message, here is the entry from the log:

[INFO] Sat Oct 19 17:04:26 2013 Response: Internal Server Error - There was an error while executing the query.

I have verbose logging turned on.

From the Redland site I was under the impression that Redstore implements the SPARQL 1.1. update syntax. And this seems to be confirmed by the option to select Update as a language option.

If it does support SPARQL 1.1. Update, does anyone know what might cause this error for this simple test case?

njh / redstore

Redstore support for SPAQL 1.1 Update #50