[main] WARN org.opendaylight.yangtools.yang.model.spi.ModuleDependencySort - Error while sorting module [extension-use, Optional.empty]: module with same namespace (urn:opendaylight:params:xml:ns:yang:controller:extension) already loaded: [extension, Optional[2013-04-05]]
[main] ERROR org.opendaylight.yangtools.yang.parser.stmt.reactor.BuildGlobalContext - Failed to parse YANG from source SourceSpecificContext [source=YinStatementStreamSource{identifier=SourceIdentifier [foo@2010-04-15]}, current=SOURCE_PRE_LINKAGE, finished=INIT]: Imported module [baar] was not found. [at <UNKNOWN>:8:27]