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java.lang.NullPointerException: null	at eu.cloudopting.bpmn.tasks.publish.update.UpdateToscaFile.execute(UpdateToscaFile.java:74)	at org.activiti.engine.impl.delegate.JavaDelegateInvocation.invoke(JavaDelegateInvocation.java:34)	at org.activiti.engine.impl.delegate.DelegateInvocation.proceed(DelegateInvocation.java:37)	at org.activiti.engine.impl.delegate.DefaultDelegateInterceptor.handleInvocation(DefaultDelegateInterceptor.java:25)	at org.activiti.engine.impl.bpmn.behavior.ServiceTaskDelegateExpressionActivityBehavior.execute(ServiceTaskDelegateExpressionActivityBehavior.java:101)	at org.activiti.engine.impl.pvm.runtime.AtomicOperationActivityExecute.execute(AtomicOperationActivityExecute.java:60)	at org.activiti.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:97)