Codeblocks error on ubuntu (help please)

Hey, ive been trying to build and run a project on ubuntu, installed everythin (i think), compiled projucer with the make file and everythin. At the moment I put build and run i get this error for a header i’m using

error: non-constant-expression cannot be narrowed from type ‘int’ to ‘std::vector::size_type’ (aka ‘unsigned long’) in initializer list [-Wc++11-narrowing]

whats does it even mean??? thanks for your help!

well i solved it lol, i just had to put on the other compiler options

-Wno-narrowing

and it was built a run.