This is a rather general error which indicates one or more problems with the POMs themselves like:
- A POM can't be parsed because its XML is not well-formed or contains invalid elements, see also ModelParseException.
- A parent POM can't be resolved, e.g. because the POM is neither present locally at the path denoted by
<relativePath>nor available in any of the
<repositories>declared in the POM or the
settings.xml, see also UnresolvableModelException.
- The contents of a POM is incomplete or otherwise semantically invalid.
- A child module of an aggregator project could not be found at the specified location.
The problem listing that accompanies the error should already indicate what and in which POMs needs to be fixed. For a detailed description of the POM, please consult the POM Reference.