Rename project in eclipse

Question

Hello everyone, 
 I tried to rename(right click the project name and click the "Rename") my project from "sdk11_ble_tutorial_adverstising" to "sdk11_ble_tutorial_adverstising1"
 
 After I done that, every source file I added before cannot be opened. I tried restart eclipse, didn't work.
 
 But makefile can be opened as usual. 
if I change the project name back to the original, still cannot open any source file. 
What happened exactly? How can I change the name of my project? 
 Thanks 
Tong

Tong Yu · Accepted Answer

I found the answer myself. After I changed the project name, the path variables also be changed in someway. So what I need to do is to correct the path variables. 
 
 The picture show that 2 new path variables appeared after I changed the project name, but they are not contain the correct path, which is the reason why I can't open any source files.