Now you cannot run tasks second time or if requirements are not met

src/main/java/ru/windcorp/progressia/common/modules/Task.java

@@ -17,6 +17,7 @@
  */
 package ru.windcorp.progressia.common.modules;
 
+import ru.windcorp.jputil.chars.StringUtil;
 import ru.windcorp.progressia.common.util.crash.CrashReports;
 import ru.windcorp.progressia.common.util.namespaces.Namespaced;
 
@@ -43,10 +44,26 @@ public abstract class Task
 
 	@Override
 	public void run() {
+		if (!canRun()) {
+			ArrayList<Task> undoneTasks = new ArrayList<>();
+			for (Task j : requiredTasks) {
+				if (!j.isDone()) {
+					undoneTasks.add(j);
+				}
+			}
+
+			throw CrashReports.report(new Throwable(),
+					"The following required Tasks are not done:\n%s",
+					StringUtil.iterableToString(undoneTasks, "\n"));
+		} else if (isDone()) {
+			throw CrashReports.report(new Throwable(),
+					"The task cannot be performed second time");
+		} else {
 			isActive = true;
 			perform();
 			isDone = true;
 		}
+	}
 
 	//This method will be invoked by Run()
 	protected abstract void perform();