SAML Module - Loader Constraint Violation

I have the SAML module installed in an existing app. Invoking the Startup microflow in this module, I get a hard error in the console and see the following stack trace:

java.lang.LinkageError: loader constraint violation: when resolving method
      "org.slf4j.impl.StaticLoggerBinder.getLoggerFactory()Lorg/slf4j/ILoggerFactory;" 
       the class loader (instance of org/apache/felix/framework/BundleWiringImpl$BundleClassLoaderJava5) 
       of the current class, org/slf4j/LoggerFactory, and the class loader
       (instance of org/apache/felix/framework/BundleWiringImpl$BundleClassLoaderJava5) for the method's
        defining class, 
        org/slf4j/impl/StaticLoggerBinder, have different Class objects for the type org/slf4j/ILoggerFactory 
        used in the signature
at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:299)
at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:269)
at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:281)
at org.opensaml.DefaultBootstrap.getLogger(DefaultBootstrap.java:225)
at org.opensaml.DefaultBootstrap.initializeXMLSecurity(DefaultBootstrap.java:168)
at org.opensaml.DefaultBootstrap.bootstrap(DefaultBootstrap.java:90)
at saml20.implementation.SAMLRequestHandler.<init>(SAMLRequestHandler.java:62)
at saml20.implementation.SAMLRequestHandler.getInstance(SAMLRequestHandler.java:56)
at saml20.implementation.SSOServerConfiguration.start(SSOServerConfiguration.java:18)
at saml20.actions.StartSSO.executeAction(StartSSO.java:28)
at saml20.actions.StartSSO.executeAction(StartSSO.java:16)
at com.mendix.systemwideinterfaces.core.UserAction.execute(UserAction.java:49)
at com.mendix.core.actionmanagement.CoreAction.doCall(CoreAction.java:260)
at com.mendix.core.actionmanagement.CoreAction.call(CoreAction.java:248)
at com.mendix.core.actionmanagement.ActionManager$1.execute(ActionManager.java:168)
at com.mendix.util.classloading.Runner.doRunUsingClassLoaderOf(Runner.java:32)
at com.mendix.core.actionmanagement.ActionManager.executeSync(ActionManager.java:174)
at com.mendix.core.component.InternalCore.execute(InternalCore.java:383)
at com.mendix.modules.microflowengine.actions.actioncall.JavaAction.execute(JavaAction.scala:52)
at com.mendix.modules.microflowengine.microflow.impl.MicroflowObject.execute(MicroflowObject.java:47)
at com.mendix.modules.microflowengine.microflow.impl.MicroflowImpl.executeAfterBreakingIfNecessary(MicroflowImpl.java:192)
at com.mendix.modules.microflowengine.microflow.impl.MicroflowImpl.executeAction(MicroflowImpl.java:149)
at com.mendix.systemwideinterfaces.core.UserAction.execute(UserAction.java:49)
at com.mendix.core.actionmanagement.CoreAction.doCall(CoreAction.java:260)
at com.mendix.core.actionmanagement.CoreAction.call(CoreAction.java:248)
at com.mendix.core.actionmanagement.ActionManager$1.execute(ActionManager.java:168)
at com.mendix.util.classloading.Runner.doRunUsingClassLoaderOf(Runner.java:32)
at com.mendix.core.actionmanagement.ActionManager.executeSync(ActionManager.java:174)
at com.mendix.core.component.InternalCore.execute(InternalCore.java:383)
at com.mendix.webui.actions.client.ExecuteAction.execute(ExecuteAction.java:135)
at com.mendix.webui.requesthandling.ClientRequestHandler$$anonfun$handleRequest$1.apply$mcV$sp(ClientRequestHandler.scala:317)
at com.mendix.webui.requesthandling.ClientRequestHandler$$anonfun$handleRequest$1.apply(ClientRequestHandler.scala:312)
at com.mendix.webui.requesthandling.ClientRequestHandler$$anonfun$handleRequest$1.apply(ClientRequestHandler.scala:312)
at com.mendix.core.session.Worker$$anonfun$receive$3$$anonfun$2$$anon$1.execute(ActionDispatching.scala:144)
at com.mendix.util.classloading.Runner.doRunUsingClassLoaderOf(Runner.java:32)
at com.mendix.core.session.Worker$$anonfun$receive$3$$anonfun$2.apply(ActionDispatching.scala:146)
at scala.util.Try$.apply(Try.scala:192)
at com.mendix.core.session.Worker$$anonfun$receive$3.applyOrElse(ActionDispatching.scala:140)
at akka.actor.Actor$class.aroundReceive(Actor.scala:465)
at com.mendix.core.session.Worker.aroundReceive(ActionDispatching.scala:136)
at akka.actor.ActorCell.receiveMessage(ActorCell.scala:516)
at akka.actor.ActorCell.invoke(ActorCell.scala:487)
at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:238)
at akka.dispatch.Mailbox.run(Mailbox.scala:220)
at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:393)
at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)

I created a test project with just the SAML module and didn't get this error. Any pointers on how to troubleshoot and correct the conflict in my project?

Thanks!