19:07:26,738 ERROR [org.jbpm.runtime.manager.impl.error.ExecutionErrorHandlerImpl] (default task-12) Unexpected error during processing : java.lang.UnsupportedOperationException
	at java.base/java.util.AbstractList.add(AbstractList.java:153)
	at java.base/java.util.AbstractList.add(AbstractList.java:111)
	at deployment.kie-server.war//org.jbpm.services.task.commands.GetUserTaskCommand.checkUserPermissions(GetUserTaskCommand.java:68)
	at deployment.kie-server.war//org.jbpm.services.task.commands.GetUserTaskCommand.execute(GetUserTaskCommand.java:55)
	at deployment.kie-server.war//org.jbpm.services.task.commands.GetUserTaskCommand.execute(GetUserTaskCommand.java:30)
	at deployment.kie-server.war//org.jbpm.services.task.commands.TaskCommandExecutorImpl$SelfExecutionCommandService.execute(TaskCommandExecutorImpl.java:80)
	at deployment.kie-server.war//org.jbpm.services.task.commands.TaskCommandExecutorImpl$SelfExecutionCommandService.execute(TaskCommandExecutorImpl.java:65)
	at deployment.kie-server.war//org.drools.core.command.impl.AbstractInterceptor.executeNext(AbstractInterceptor.java:39)
	at deployment.kie-server.war//org.jbpm.services.task.persistence.TaskTransactionInterceptor.execute(TaskTransactionInterceptor.java:88)
	at deployment.kie-server.war//org.jbpm.services.task.persistence.TaskTransactionInterceptor.execute(TaskTransactionInterceptor.java:49)
	at deployment.kie-server.war//org.drools.core.command.impl.AbstractInterceptor.executeNext(AbstractInterceptor.java:39)
	at deployment.kie-server.war//org.drools.persistence.jta.TransactionLockInterceptor.execute(TransactionLockInterceptor.java:73)
	at deployment.kie-server.war//org.drools.persistence.jta.TransactionLockInterceptor.execute(TransactionLockInterceptor.java:45)
	at deployment.kie-server.war//org.drools.core.command.impl.AbstractInterceptor.executeNext(AbstractInterceptor.java:39)
	at deployment.kie-server.war//org.drools.persistence.jpa.OptimisticLockRetryInterceptor.internalExecute(OptimisticLockRetryInterceptor.java:102)
	at deployment.kie-server.war//org.drools.persistence.jpa.OptimisticLockRetryInterceptor.execute(OptimisticLockRetryInterceptor.java:83)
	at deployment.kie-server.war//org.drools.persistence.jpa.OptimisticLockRetryInterceptor.execute(OptimisticLockRetryInterceptor.java:44)
	at deployment.kie-server.war//org.drools.core.command.impl.AbstractInterceptor.executeNext(AbstractInterceptor.java:39)
	at deployment.kie-server.war//org.jbpm.runtime.manager.impl.error.ExecutionErrorHandlerInterceptor.internalExecute(ExecutionErrorHandlerInterceptor.java:66)
	at deployment.kie-server.war//org.jbpm.runtime.manager.impl.error.ExecutionErrorHandlerInterceptor.execute(ExecutionErrorHandlerInterceptor.java:52)
	at deployment.kie-server.war//org.jbpm.runtime.manager.impl.error.ExecutionErrorHandlerInterceptor.execute(ExecutionErrorHandlerInterceptor.java:29)
	at deployment.kie-server.war//org.drools.core.runtime.InternalLocalRunner.execute(InternalLocalRunner.java:37)
	at deployment.kie-server.war//org.drools.core.runtime.InternalLocalRunner.execute(InternalLocalRunner.java:41)
	at deployment.kie-server.war//org.jbpm.services.task.commands.TaskCommandExecutorImpl.execute(TaskCommandExecutorImpl.java:49)
	at deployment.kie-server.war//org.jbpm.services.task.impl.command.CommandBasedTaskService.execute(CommandBasedTaskService.java:159)
	at deployment.kie-server.war//org.jbpm.runtime.manager.impl.task.SynchronizedTaskService.execute(SynchronizedTaskService.java:851)
	at deployment.kie-server.war//org.jbpm.kie.services.impl.UserTaskServiceImpl.execute(UserTaskServiceImpl.java:1099)
	at deployment.kie-server.war//org.kie.server.services.jbpm.ui.FormServiceBase.getFormDisplayTask(FormServiceBase.java:149)
	at deployment.kie-server.war//org.kie.server.remote.rest.jbpm.ui.FormResource.getTaskForm(FormResource.java:163)