Did you review the package dependency information as suggested earlier in this thread? The error points to an issue with the package dependency check process which in turn usually means someone added an invalid package dependency. See the IS Administrator’s Guide for info on package dependencies.
Obviously, going through the “what has changed since this last worked?” analysis for your IS might help point to the specific package containing the error.
Mark
#webMethods-Archive#Integration-Server-and-ESB#webMethods