Unknown target action or sequence %s
The target sequence for the Run Sequence action does not appear in the list of action sequences for the current package. This may be due to a misspelling of the target sequence's name, or because the target sequence was deleted, or because no target sequence was specified at all (name will be empty in that case).
Without a valid target sequence, the Run Sequence action will fail and will probably cause the installation to fail as well.
Make sure that the Run Sequence action specifies an existing action sequence within the same package.