A problem occurred while processing the request. Please check our bug tracker to see if a similar problem has already been reported. If it is already reported, please vote and put a comment on it to let us gauge the impact of the problem. If you think this is a new issue, please file a new issue. When you file an issue, make sure to add the entire stack trace, along with the version of Jenkins and relevant plugins. The users list might be also useful in understanding what has happened.

Stack trace

javax.servlet.ServletException: java.lang.NoSuchMethodError: com.amazonaws.services.ec2.AmazonEC2.createTags(Lcom/amazonaws/services/ec2/model/CreateTagsRequest;)V
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:796)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:876)
at org.kohsuke.stapler.MetaClass$5.doDispatch(MetaClass.java:233)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:58)
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:746)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:876)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:649)
at org.kohsuke.stapler.Stapler.service(Stapler.java:238)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:812)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1669)
at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:135)
at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:126)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:80)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:84)
at hudson.security.UnwrapSecurityExceptionFilter.doFilter(UnwrapSecurityExceptionFilter.java:51)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at jenkins.security.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:117)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at org.acegisecurity.providers.anonymous.AnonymousProcessingFilter.doFilter(AnonymousProcessingFilter.java:125)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at org.acegisecurity.ui.rememberme.RememberMeProcessingFilter.doFilter(RememberMeProcessingFilter.java:142)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at org.acegisecurity.ui.AbstractProcessingFilter.doFilter(AbstractProcessingFilter.java:271)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at jenkins.security.BasicHeaderProcessor.doFilter(BasicHeaderProcessor.java:93)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at org.acegisecurity.context.HttpSessionContextIntegrationFilter.doFilter(HttpSessionContextIntegrationFilter.java:249)
at hudson.security.HttpSessionContextIntegrationFilter2.doFilter(HttpSessionContextIntegrationFilter2.java:67)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76)
at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:171)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
at org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:49)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
at hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:82)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
at org.kohsuke.stapler.DiagnosticThreadNameFilter.doFilter(DiagnosticThreadNameFilter.java:30)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:585)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:553)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
at org.eclipse.jetty.server.Server.handle(Server.java:499)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:311)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257)
at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:544)
at winstone.BoundedExecutorService$1.run(BoundedExecutorService.java:77)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NoSuchMethodError: com.amazonaws.services.ec2.AmazonEC2.createTags(Lcom/amazonaws/services/ec2/model/CreateTagsRequest;)V
at hudson.plugins.ec2.SlaveTemplate.updateRemoteTags(SlaveTemplate.java:882)
at hudson.plugins.ec2.SlaveTemplate.provisionSpot(SlaveTemplate.java:822)
at hudson.plugins.ec2.SlaveTemplate.provision(SlaveTemplate.java:374)
at hudson.plugins.ec2.EC2Cloud.getNewOrExistingAvailableSlave(EC2Cloud.java:515)
at hudson.plugins.ec2.EC2Cloud.doProvision(EC2Cloud.java:340)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:324)
at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:167)
at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:100)
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)
... 58 more

Amazon EC2 plugin
Allow Jenkins to start slaves on EC2 or Eucalyptus on demand, and kill them as they get unused.
1.35
Uninstall

Amazon Web Services SDK
This plugin provides AWS SDK for Java for other plugins.
1.11.37
DOWNGRADE TO 1.10.50
Uninstall

Ant Plugin
This plugin adds Apache Ant support to Jenkins.
1.4
DOWNGRADE TO 1.3
Uninstall

bouncycastle API Plugin
Provides an stable API to Bouncy Castle related tasks. Plugins using Bouncy Castle should depend on this plugin and not directly on Bouncy Castle
1.648.3
Uninstall

Branch API Plugin
This plugin provides an API for multiple branch based projects.
1.11
DOWNGRADE TO 1.10.2
Uninstall

build timeout plugin
This plugin allows builds to be automatically terminated after the specified amount of time has elapsed.
1.17.1
Uninstall

build-name-setter
This plug-in sets the display name of a build to something other than #1, #2, #3, ...
1.6.5
Uninstall

CloudBees Amazon Web Services Credentials Plugin
Allows storing Amazon IAM credentials within the Jenkins Credentials API.
1.16
Uninstall

Copy Artifact Plugin
Adds a build step to copy artifacts from another project.
1.38.1
Uninstall

Credentials Binding Plugin
Allows credentials to be bound to environment variables for use from miscellaneous build steps.
1.9
DOWNGRADE TO 1.8
Uninstall

Credentials Plugin
This plugin allows you to store credentials in Jenkins.
2.1.5
DOWNGRADE TO 2.1.4
Uninstall

Display URL API
Provides the DisplayURLProvider extension point to provide alternate URLs for use in notifications
0.5
DOWNGRADE TO 0.3
Uninstall

Docker plugin
This plugin integrates Jenkins with Docker
0.16.2
DOWNGRADE TO 0.16.1
Uninstall

Durable Task Plugin
Library offering an extension point for processes which can run outside of Jenkins yet be monitored.
1.12
Uninstall

External Monitor Job Type Plugin
Adds the ability to monitor the result of externally executed jobs.
1.6
Uninstall

Folders Plugin
This plugin allows users to create "folders" to organize jobs. Users can define custom taxonomies (like by project type, organization type etc). Folders are nestable and you can define views within folders. Maintained by CloudBees, Inc.
5.13
DOWNGRADE TO 5.12
Uninstall

Git client plugin
Shared library plugin for other Git related Jenkins plugins.
2.0.0
DOWNGRADE TO 1.21.0
Uninstall

Git Parameter Plug-In
Adds ability to choose from git repository revisions or tags
0.7.0
DOWNGRADE TO 0.6.2
Uninstall

Git plugin
This plugin integrates Git with Jenkins.
3.0.0
DOWNGRADE TO 2.5.3
Uninstall

GIT server Plugin
Allows Jenkins to act as a Git server.
1.7
Uninstall

Icon Shim Plugin
This plugin allows other Jenkins plugins to take advantage of the <l:icon> tag.
2.0.3
Uninstall

Jackson 2 API Plugin
This plugin exposes the Jackson 2 JSON APIs to other Jenkins plugins.
2.7.3
Uninstall

Javadoc Plugin
This plugin adds Javadoc support to Jenkins.
1.4
Uninstall

JavaScript GUI Lib: ACE Editor bundle plugin
JavaScript GUI Lib: ACE Editor bundle plugin.
1.1
Uninstall

JavaScript GUI Lib: Handlebars bundle plugin
JavaScript GUI Lib: Handlebars bundle plugin.
1.1.1
Uninstall

JavaScript GUI Lib: jQuery bundles (jQuery and jQuery UI) plugin
JavaScript GUI Lib: jQuery bundles (jQuery and jQuery UI) plugin.
1.2.1
Uninstall

JavaScript GUI Lib: Moment.js bundle plugin
JavaScript GUI Lib: Moment.js bundle plugin.
1.1.1
Uninstall

Job Configuration History Plugin
Job history plugin for Jenkins.
2.15
Uninstall

jQuery plugin
This allows other plugins to use jQuery in UI.
1.11.2-0
Uninstall

JUnit Plugin
Allows JUnit-format test results to be published.
1.18
Uninstall

LDAP Plugin
Adds LDAP authentication to Jenkins
1.13
DOWNGRADE TO 1.12
Uninstall

Locale plugin
This plugin lets you control the language of Jenkins.
1.2
Uninstall

Mailer Plugin
This plugin allows you to configure email notifications for build results. This is a break-out of the original core based email component.
1.18
DOWNGRADE TO 1.17
Uninstall

MapDB API Plugin
This plugin provides a shared dependency on the MapDB library so that other plugins can co-operate when using this library.
1.0.9.0
Uninstall

Matrix Authorization Strategy Plugin
Offers matrix-based security authorization strategies (global and per-project).
1.4
Uninstall

Matrix Project Plugin
Multi-configuration (matrix) project type.
1.7.1
Uninstall

Maven Integration plugin
This plugin provides an advanced integration for Maven 2/3 projects.
2.13
Uninstall

Multiple SCMs plugin
This plugin enables the selection of multiple source code management systems for a build. For example, it enables checking out the source code from one SCM while checking out legacy or third-party code from another.
0.6
Uninstall

Node and Label parameter plugin
This plugin adds two new parameter types to job configuration - node and label, this allows to dynamically select the node where a job/project should be executed.
1.7.2
Uninstall

Node Iterator API Plugin
This plugin provides support for iterating through all the Node instances that are in use by Jenkins, even those Node instances that are not traditionally attached to Jenkins. The API exposed by this plugin can be used by cloud provider plugins to identify unused provisioned resource.
1.5.0
Uninstall

OWASP Markup Formatter Plugin
Uses the OWASP Java HTML Sanitizer to allow safe-seeming HTML markup to be entered in project descriptions and the like.
1.5
Uninstall

PAM Authentication plugin
Adds Unix Pluggable Authentication Module (PAM) support to Jenkins.
1.3
Uninstall

Pipeline: SCM Step
Adds a Pipeline step to check out or update working sources from various SCMs (version control).
2.2
Uninstall

Pipeline: Step API
API for asynchronous build step primitive.
2.4
DOWNGRADE TO 2.3
Uninstall

Plain Credentials Plugin
Allows use of plain strings and files as credentials.
1.3
DOWNGRADE TO 1.2
Uninstall

S3 publisher plugin
This is a plugin to upload files to Amazon S3 buckets.
0.10.9
DOWNGRADE TO 0.10.7
Uninstall

SCM API Plugin
This plugin provides a new enhanced API for interacting with SCM systems.
1.3
DOWNGRADE TO 1.2
Uninstall

Script Security Plugin
Allows Jenkins administrators to control what in-process scripts can be run by less-privileged users.
1.23
DOWNGRADE TO 1.22
Uninstall

Simple Theme Plugin
A plugin for Jenkins that supports custom CSS & JavaScript. You can customize Jenkins's appearance (ex. his gentle face on the background).
0.3
Uninstall

SSH Credentials Plugin
This plugin allows you to store SSH credentials in Jenkins.
1.12
Uninstall

SSH Slaves plugin
This plugin allows you to manage slaves running on *nix machines over SSH.
1.11
Uninstall

Structs Plugin
Library plugin for DSL plugins that need names for Jenkins objects.
1.5
DOWNGRADE TO 1.3
Uninstall

Subversion Plug-in
This plugin adds the Subversion support (via SVNKit) to Jenkins.
2.6
Uninstall

ThinBackup
This plugin simply backs up the global and job specific configurations (not the archive or the workspace).
1.7.4
Uninstall

Timestamper
Adds timestamps to the Console Output.
1.8.6
DOWNGRADE TO 1.8.5
Uninstall

Token Macro Plugin
This plug-in adds reusable macro expansion capability for other plug-ins to use.
2.0
DOWNGRADE TO 1.12.1
Uninstall

Windows Slaves Plugin
Allows you to connect to Windows machines and start slave agents on them.
1.2
Uninstall

Workspace Cleanup Plugin
This plugin deletes the project workspace after a build is finished.
0.30