Unity3 Build Error?

I have a project file from 2.6

I opened it on 3.0

It was successful and can play game.

But console window show many red ! icon error which was not exist at 2.6

Still I can play game regardless of red ! icon.

But when I try to make build, it just stops and can’t build.

Why?

I have a slightly similar problem. Project imported from 2.6 when built in 3.0 the resulting player will not open and play. I am on a Mac, snow leopard, and have tried all the usual things like chucking preferences, restarting and fixing permissions. Any help appreciated!

Error building Player: Extracting referenced dlls failed.
UnityEditor.HostView:OnGUI()

!IsActive () !m_RunInEditMode

These are errors when try to make build setting and standalone build.