It looks like you have added the include path the Compilers uses automatically in the wrong way.
Check your Code::Blocks compiler configuration.
Edit: Make sure you pick the right Compiler from the "Selected Compiler" Pull-down list and make it the default compiler
This one is likely right
"Settings->Compiler and Debugger->Global Compiler settings->Toolchain executables"
But,
"Settings->Compiler and Debugger->Global Compiler settings->Search Directory" is likely wrong
The Three Sub Tabs are empty on me.
And
"Settings->Compiler and Debugger->Global Compiler settings->Linker Settings"
is also empty on mine.
Tim S.