error during debugging loop: TypeError: firstViewRangeElement is null"

please help, I am using Jquery Mobile and I get the following error in my console:

error during debugging loop: TypeError: firstViewRangeElement is null"

here is my site: http://m.slapp.me

user: test
pass: test

And we are supposed to GUESS what actions we should take to produce the error?

Okay, I logged in. NOW what am I supposed to do?

Oh...and what browser/debugger are you using?