Error in Excel export

Hi, I am trying to do a simple Excel export using the standard functionality in a grid but this returns a system error Caused by: com.mendix.core.CoreRuntimeException: Exception occurred in action '{}', all database changes executed by this action were rolled back at com.mendix.core.actionmanagement.CoreAction.processErrorState(SourceFile:343) Caused by: java.lang.IndexOutOfBoundsException: Index: 0, Size: 0 at java.util.ArrayList.rangeCheck(Unknown Source) Any suggestions about the cause or a solution?
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