Issue using TargetNullValue in Bindings

[henda79]

Recently I've came across this issue where Gorilla Player would show an error on several of my XAML files even though they work render fine on the device.

The error is:

Cannot read property 'ISSUE_XAML_AREA' of undefined

I spent hours trying to work out this cryptic message and finally found that it was down to the TargetNullValue on a binding.

With this removed the XAML previews fine, if I add it back, the errors occurs.

Any ideas how to fix this ?