So I just spent an hour on a call with a client trying to track down a problem in an application which just eluded me. A very odd error message showed up after creating a document:

Could not create the page /.xsp because the class Xsp_002e could not be found.

Of course I spotted what the problem was as soon as I hung up on the phone, guessed yet?

I had forgotten to change the launch options for the application to open an XPage, so the XPage field was left blank like so:

The simple solution was this:

And that’s probably an indicator that my brain is fried this week!