error reading variable: Could not find the frame base

I am using Clion IDe, with gcc/g++ & gdb for debugger.

In the CMakeList.txt, I have the following compiler options set. set(CMAKE_CXX_FLAGS -std=c++11 -fopenmp -fPIC -O0 -gdwarf-2 -finline-functions)

I can view the variable values in main() but not any other classes. It shows the error for all methods called from the main directly or nested :

<error reading variable: Could not find the frame base for xxxxclass::xxxMethod> Any pointer would be helpful.