When using "File Search" in Myeclipse , it will popup a window with the error message "File Search" has encountered a problem".
Why it cause , because of " ... Resource is out of sync with the file system " . That is saying that your .java and other files in the Myeclipse Workspace does not synchronize with File System file .
The resolve way :
A . Recommended . Right click your project , and click Refresh .
B . Not Recommended . Window->Preferences->General->Workspace，select "Refresh automatically" .