Xcode 2.5 & SysError 0

I updated to Xcode 2.5 and now the sample code plug-ins do not build. I get the following error when I try to build Dissolve:

Message:

SysError 0 during open of ''PIDefines.h''

Location:

Dissolve.r 11

this is the include statement #include ''PIDefines.h''

The file opens fine in the project. I gather this is a known error. I saw a posting on an InDesign Forum about the same problems and several posting from a couple of years ago when a version of Xcode had the problem. I cannot find any posted solutions though.

Can anyone tell me what I need to do to cure this problem.

Thanks.