Check your log( or console) for more detail about the error.
That won't answer the question. Because the same item on place 12 works
Its Correct its seams like a data-related error. The strange part is if the same item is on the 12th position it works. All items after the 12th position occur the same error
java.lang.IllegalArgumentException: The given member name 'Module1.entity1_entity2' has no corresponding member in this object of type 'Module1.entity1' at com.mendix.core.objectmanagement.MendixObjectImpl.getMember(SourceFile:260) at com.mendix.core.objectmanagement.MendixObjectImpl.getMember(SourceFile:39) at com.mendix.jH.a(SourceFile:121) at com.mendix.jH$d.a(SourceFile:101) at com.mendix.jH$d.apply(SourceFile:99) at scala.collection.immutable.HashSet$HashSet1.foreach(HashSet.scala:153) at scala.collection.immutable.HashSet$HashTrieSet.foreach(HashSet.scala:306) at com.mendix.jH.b(SourceFile:99) at com.mendix.jH.a(SourceFile:83) at com.mendix.jH.a(SourceFile:44) at com.mendix.pG.a(SourceFile:296) at com.mendix.pG$a.apply$mcI$sp(SourceFile:195) at com.mendix.pG$i.a(SourceFile:211) at com.mendix.pG$i.execute(SourceFile:208) at com.mendix.core.session.Worker$$anonfun$receive$3.applyOrElse(SourceFile:132) at akka.actor.ActorCell.receiveMessage(ActorCell.scala:498) at akka.actor.ActorCell.invoke(ActorCell.scala:456) at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:237) at akka.dispatch.Mailbox.run(Mailbox.scala:219) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:744)