Waiting for the debugger to connect

(Sorry for my english!)

When I debug my application the simulator opens, but nothing ... in monodevelop ide it shows a warning window with the message "Waiting for debugger to connect ..."

Someday, the simulator will ask me that the application is loading ... but what?

why?

in the past, I installed monodevelop 2.6, then monodevelop 2.6 and 2.8 together, NOW: monodevelop 2.8 only

Can anyone help me?

how can i solve all these problems?

Thank you