Error on startup log does not provide pointer to find the cause, org.onehippo.cm.model.parser.ParserException: Nodes that specify '.meta:category: content' cannot contain other keys

[INFO] [talledLocalContainer] 26.06.2017 20:52:38 ERROR localhost-startStop-1 [ConfigurationServiceImpl.start:99] Failed to start the ConfigurationService
[INFO] [talledLocalContainer] javax.jcr.RepositoryException: org.onehippo.cm.model.parser.ParserException: Nodes that specify '.meta:category: content' cannot contain other keys in 'reader', line 6, column 9:
[INFO] [talledLocalContainer] .meta:category: content
[INFO] [talledLocalContainer] ^
[INFO] [talledLocalContainer] at org.onehippo.cm.engine.ConfigurationServiceImpl.loadBootstrapModel(ConfigurationServiceImpl.java:416) ~[hippo-repository-engine-5.0.0-SNAPSHOT.jar:5.0.0-SNAPSHOT]
[INFO] [talledLocalContainer] at org.onehippo.cm.engine.ConfigurationServiceImpl.init(ConfigurationServiceImpl.java:131) ~[hippo-repository-engine-5.0.0-SNAPSHOT.jar:5.0.0-SNAPSHOT]
[INFO] [talledLocalContainer] at org.onehippo.cm.engine.ConfigurationServiceImpl.start(ConfigurationServiceImpl.java:96) [hippo-repository-engine-5.0.0-SNAPSHOT.jar:5.0.0-SNAPSHOT]
[INFO] [talledLocalContainer] at org.hippoecm.repository.LocalHippoRepository.initialize(LocalHippoRepository.java:288) [hippo-repository-engine-5.0.0-SNAPSHOT.jar:5.0.0-SNAPSHOT]
[INFO] [talledLocalContainer] at org.hippoecm.repository.LocalHippoRepository.create(LocalHippoRepository.java:127) [hippo-repository-engine-5.0.0-SNAPSHOT.jar:5.0.0-SNAPSHOT]
[INFO] [talledLocalContainer] at org.hippoecm.repository.LocalHippoRepository.create(LocalHippoRepository.java:117) [hippo-repository-engine-5.0.0-SNAPSHOT.jar:5.0.0-SNAPSHOT]
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