You can try some tricks applying for that. Such as
At first complete project download from repository. then try those tricks.
number 1#: File=>Import=>android=>Existing android code Into workspace.
number 2#: Project=>clean..
number 3#: delete folder bin and folder are both.
number 4#: check easing exist or not.(in res/libs folder)
and finally number 5#: Restart eclipse.
I am not sure but i expected you will be get help probably. Best of Luck!