Cannot load discovery exclusions from file: '[full path to DiscoveryExclusion.txt]'.
Package Builder specifies a set of exclusions in the specified file, which define a set of files which will not be included when discovering dependencies of files. The discovery exclusion file could not be loaded or a default file could not be created at the specified path.
Check that the file path can be accessed with current user privileges. If the file does not exist, check that a file can be created at the specified path.