Eclipse Problem

[xTrinky]

Alloz guys i have a big problem and i cant find a solution.

my problim that if i write smth and press an error window shows up.

 

Example i write "import java." when i press that dot it show a window that says to me

 

"Tittle of window: Cannot Perform Operation"

"Message of window: This compilation unit is not on the build path of Java project"

 

 

dafuq us this ?? :/

[xTrinky]

up....come on guys help me :(

[Tryskell]