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java.lang.NullPointerException: null	at com.containersol.minimesos.container.AbstractContainer.imageExists(AbstractContainer.java:223)	at com.containersol.minimesos.container.AbstractContainer.pullImage(AbstractContainer.java:234)	at com.containersol.minimesos.container.AbstractContainer.pullImage(AbstractContainer.java:57)	at com.containersol.minimesos.container.AbstractContainer.start(AbstractContainer.java:88)	at com.containersol.minimesos.cluster.MesosCluster.lambda$start$0(MesosCluster.java:131)	at java.util.ArrayList.forEach(ArrayList.java:1249)	at com.containersol.minimesos.cluster.MesosCluster.start(MesosCluster.java:131)	at com.containersol.minimesos.cluster.MesosCluster.start(MesosCluster.java:117)	at com.containersol.minimesos.main.CommandUp.execute(CommandUp.java:85)	at com.containersol.minimesos.main.Main.run(Main.java:107)	at com.containersol.minimesos.main.Main.main(Main.java:59)