Eclipse signals an error, but code compilation

I am writing C ++ code with eclipe.

I have strange behavior with vector objects.

When I use a method resize, for example, Eclipse returns the following error:

#include "vector"

   ...

   vector<int> a;
   a.resize(5);

   Error: Invalid arguments candidates are: void resize(?, int).

However, the code is compiled from the command line.

How can I fix this squeamish eclipse behavior?