problem with master Detail and navigation

Hello

I began to create a project, was following in the footsteps of this project "https://github.com/jamesmontemagno/Hanselman.Forms" but when I begin to navigate the menu items get the following message:

[Mono] [0xba013240] hill climbing, change max number of threads 4
[Mono] [0xba894098] hill climbing, change max number of threads 20

and also realized that is catching the menu