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    When you have no build parameters, uncheck 'This build is parameterized'

Solutions on the web

via Google Groups by stop...@google.com (JIRA), 1 year ago
java.lang.ClassCastException: net.sf.json.JSONNull cannot be cast to net.sf.json.JSONObject
via Jenkins JIRA by Serhiy Topchiy, 1 year ago
java.lang.ClassCastException: net.sf.json.JSONNull cannot be cast to net.sf.json.JSONObject
via Jenkins JIRA by Hector Santana, 1 year ago
java.lang.Error: Failed to instantiate class hudson.scm.browsers.FishEyeSVN from {"url":"${FISHEYE_SERVER_BASE}/Test/","rootModule":"branches/alpha","stapler-class":"hudson.scm.browsers.FishEyeSVN","$class":"hudson.scm.browsers.FishEyeSVN"}
via Google Groups by Eddard, 1 year ago
java.lang.Error: Failed to instantiate class com.dabsquared.gitlabjenkins.GitLabPushTrigger from {"triggerOnPush":true,"triggerOnMergeRequest":true,"triggerOpenMergeRequestOnPush":"never","triggerOnNoteRequest":true,"noteRegex":"Jenkins please retry
via GitHub by Normo
, 1 year ago
java.lang.Error: Failed to instantiate class com.dabsquared.gitlabjenkins.GitLabPushTrigger from {"triggerOnPush":true,"triggerOnMergeRequest":true,"triggerOpenMergeRequestOnPush":"both","triggerOnNoteRequest":false,"noteRegex":"","ciSkip":true
via Google Groups by clec...@cloudbees.com (JIRA), 1 year ago
java.lang.IllegalArgumentException: Failed to instantiate interface com.cloudbees.plugins.credentials.Credentials from {"scope":"GLOBAL","keyStoreSource":{"value":"1","uploadedKeystore
java.lang.ClassCastException: net.sf.json.JSONNull cannot be cast to net.sf.json.JSONObject	at hudson.model.ParametersDefinitionProperty._doBuild(ParametersDefinitionProperty.java:148)	at jenkins.model.ParameterizedJobMixIn.doBuild(ParameterizedJobMixIn.java:191)	at hudson.model.AbstractProject.doBuild(AbstractProject.java:1745)	at hudson.model.AbstractProject.doBuild(AbstractProject.java:1751)	at sun.reflect.GeneratedMethodAccessor1252.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:606)	at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:320)	at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:163)	at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:96)	at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:124)	at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:58)	at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:746)