请大伙帮我看看为什么编译错误

第一个文件编译通过
第二个总数出错:
C:\Documents and Settings\TGM.INC2>F:\JavaGroup\jdk1.3.1_01\bin\javac F:\JavaGro
up\jdk1.3.1_01\bin\Test\rmitest\PerfectTime.java
F:\JavaGroup\jdk1.3.1_01\bin\Test\rmitest\PerfectTime.java:7: cannot resolve sym
bol
symbol  : class PerfectTimeI
location: class Test.rmitest.PerfectTime
public class PerfectTime extends UnicastRemoteObject implements PerfectTimeI
                                                                ^
1 error