Not able to set breakpoint in visual studio

Question

I am using Visual Studio 2013 and I am facing a weird issue from last few days. Whenever I try to set a break point, I get an error

\"The Following breakpoint can         


        

Answer 1

Check your program for subtle bugs. My failure chain that caused this error was:

1. I inadvertently put a duplicate key/value pair in App.config
2. Code that read that key/value via the ConfigurationManager silently failed
3. Structs returned by that code were invalid
4. Breakpoints on any line that referenced the invalid structs failed to bind

Once I fixed Item 1, everything started working again.