Warning: Failed opening '....' for inclusion (.....) in Unknown on line 0

Hiya Everyone! I'm a little baffled on what is happening. I'm using Apache on the UNIX machine. When I built the website, everyone work okay. Then I accidently remove part of the web directory because I was in the wrong directory at that time. So, I had to restore the lost directory from the tape backup. All of the deleted file had been restored. Then that's when this problem came up. I kept getting the error message on some files with a "Warning: Failed opening '...' for inclusion (....) in Unknown on line 0". I did some troubleshooting but with no luck. Can someone tell me what the problem is? Have I overlooked something? Thanks, Scott