Failed to load org.jenkinsci.plugins.github.pullrequest.extra.GitHubPRLabelUnblockQueueCondition$DescriptorImpl
java.lang.ClassNotFoundException: org.jenkinsci.plugins.blockqueuedjob.condition.BlockQueueCondition$BlockQueueConditionDescriptor
	at jenkins.util.AntClassLoader.findClassInComponents(AntClassLoader.java:1374)
	at jenkins.util.AntClassLoader.findClass(AntClassLoader.java:1327)
	at jenkins.util.AntClassLoader.loadClass(AntClassLoader.java:1080)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
Caused: java.lang.NoClassDefFoundError: org/jenkinsci/plugins/blockqueuedjob/condition/BlockQueueCondition$BlockQueueConditionDescriptor
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
	at jenkins.util.AntClassLoader.defineClassFromData(AntClassLoader.java:1140)
	at hudson.ClassicPluginStrategy$AntClassLoader2.defineClassFromData(ClassicPluginStrategy.java:858)
	at jenkins.util.AntClassLoader.getClassFromStream(AntClassLoader.java:1311)
	at jenkins.util.AntClassLoader.findClassInComponents(AntClassLoader.java:1364)
	at jenkins.util.AntClassLoader.findClass(AntClassLoader.java:1327)
	at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at jenkins.ClassLoaderReflectionToolkit.invoke(ClassLoaderReflectionToolkit.java:44)
	at jenkins.ClassLoaderReflectionToolkit._findClass(ClassLoaderReflectionToolkit.java:81)
	at hudson.PluginManager$UberClassLoader.findClass(PluginManager.java:1893)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	at org.jvnet.hudson.annotation_indexer.Index$2$1.fetch(Index.java:99)
	at org.jvnet.hudson.annotation_indexer.Index$2$1.hasNext(Index.java:73)
	at 
.plugins.ec2.EC2Cloud provisionSlaveTemplate{ami='ami-xxx', labels='cloud-slave'}. Attempting to provision slave needed by excess workload of 1 units
Oct 12, 2018 7:52:06 AM INFO hudson.plugins.ec2.EC2Cloud getNewOrExistingAvailableSlaveSlaveTemplate{ami='ami-xxx', labels='cloud-slave'}. Cannot provision - no capacity for instances: 0
Oct 12, 2018 7:52:06 AM WARNING hudson.plugins.ec2.EC2Cloud provisionCan't raise nodes for SlaveTemplate{ami='ami-xxx', labels='cloud-slave'}
Oct 12, 2018 7:52:15 AM INFO hudson.plugins.ec2.EC2Cloud provisionSlaveTemplate{ami='ami-xxx', labels='cloud-slave'}. Attempting to provision slave needed by excess workload of 1 units
Oct 12, 2018 7:52:16 AM INFO hudson.plugins.ec2.EC2Cloud getNewOrExistingAvailableSlaveSlaveTemplate{ami='ami-xxx', labels='cloud-slave'}. Cannot provision - no capacity for instances: 0
Oct 12, 2018 7:52:16 AM WARNING hudson.plugins.ec2.EC2Cloud provisionCan't raise nodes for SlaveTemplate{ami='ami-xxx', labels='cloud-slave'}