IL2CPP Xcode build error "member access into incomplete type"

Hello

I'm using Unity v.5.3.6, and everything was OK, until one day I added some new classes to my project, and Xcode start throwing the following errors:


~my_path~/Classes/Native/Bulk_Assembly-CSharp_2.cpp:177:8: note: forward declaration of 'Vector2U5BU5D_t2741383957'
struct Vector2U5BU5D_t2741383957;
^
~my_path~/Classes/Native/Bulk_Assembly-CSharp_2.cpp:10983:213: error: member access into incomplete type 'Vector2U5BU5D_t2741383957'
...

IL2CPP Xcode build error "member access into incomplete type"