今天遇到该问题，clean and rebuild 不行。
Tools->Options->Debugging->General->去掉Require source files to exactly match the original version之前的勾即可。
我怀疑可能是输入某些不兼容的编码导致，因为在编译信息中发现一个警告：
warning C4819: The file contains a character that cannot be represented in the current code page (936). Save the file in Unicode format to prevent data loss。。。
there is no source code available for the current location的解决方法
原文：http://www.cnblogs.com/JackieWu/p/5022205.html