I have made a portable class library in visual studio 2013 and I want to use it in a windows phone 7 project that I that I have made using visual studio 2012. But I don't know and not getting how to use it in windows phone 7 project.
But I have added it like a existing project to my WP 7 project and then tried to add a reference to it but it is throwing an error.
What is your portable class library targeting, and which version of Windows Phone is your project targeting? You can get that error message if the PCL doesn't support the version of Windows Phone you are targeting.