Junit test fails when run on package but succeeds when run on file

Major update: Has anyone encountered this before?

I am using JUnit 4.5 and Mockito 1.7 in a Maven project.

I have testCaseA.java in testCaseFolder package. If I open testCaseA.java, right click on the code, select "Run As" - "Junit Test" it works. However, if I right click on the package, select "Run As" - "Junit Test", it fails:

org.mockito.exceptions.misusing.InvalidUseOfMatchersException: 
Misplaced argument matcher detected!
Somewhere before this line you probably misused Mockito argument matchers.
For example you might have used anyObject() argument matcher outside of verification or stubbing.
Here are examples of correct usage of argument matchers:
    when(mock.get(anyInt())).thenReturn(null);
    doThrow(new RuntimeException()).when(mock).someVoidMethod(anyObject());
    verify(mock).someMethod(contains("foo"));
    at testCaseA.setUP(testCaseA.java:33) 

Line 33 is://MockitoAnnotations.initMocks(this);***//it said this is error***

Here is the code:

SomeService service;
@Mock
private CommonService commonService;
@Mock
public Errors errors;

@Before
public void setUp() {
    MockitoAnnotations.initMocks(this);***//it said this is error***
}

@Test
public void testvalidate() {
    //fail even here is empty
}