InvalidSyntaxException is thrown because your ssp is incorrect, it has the wrong syntax.
1.12 means exactly as Daniel says: line 1, column 12 of the template file. Scalate (the templating engine) takes your ssp files and translates them into Scala, which it then compiles. As sbt advises, run
last compile:sources
and this will give you more information. Scalate isn't very helpful about the files it is parsing, but this will probably be the ssp you added. It gives you the name of the file when it can't compile the resulting Scala file, but doesn't when it can't parse the ssp. This is really an issue that should be raised in the Scalate Assembla space.