Hi Christian,

I encountered this error-message.

I have a strong feeling that this error is related to previous reports, see

· my email dd 13-05-2013 and 03-12-2014

My  program is heavily recursive so it is hard to create a running snippet but I will try.

Hopefully in the mean time you can have a look at the error.

TIA,

Rob Stapper

=====================================

Error:

Improper use? Potential bug? Your feedback is welcome:

Contact: basex-talk@mailman.uni-konstanz.de

Version: BaseX 8.6.1 beta 855f949

Java: Oracle Corporation, 1.8.0_31

OS: Windows Vista, x86

Stack Trace:

java.lang.RuntimeException: $seq_1644 as (function(*))? index: 87, slot: 9

                at org.basex.util.Util.notExpected(Util.java:62)

                at org.basex.query.var.QueryStack.pos(QueryStack.java:101)

                at org.basex.query.var.QueryStack.set(QueryStack.java:123)

                at org.basex.query.QueryContext.set(QueryContext.java:756)

                at org.basex.query.expr.gflwor.Let$LetEval.next(Let.java:184)

                at org.basex.query.expr.gflwor.GFLWOR.item(GFLWOR.java:58)

                at org.basex.query.expr.ParseExpr.toItem(ParseExpr.java:488)

                at org.basex.query.expr.ParseExpr.toArray(ParseExpr.java:663)

                at org.basex.query.func.fn.FnApply.value(FnApply.java:32)

                at org.basex.query.func.Closure.item(Closure.java:288)

                at org.basex.query.func.Closure.value(Closure.java:321)

                at org.basex.query.expr.gflwor.GFLWOR.value(GFLWOR.java:72)

                at org.basex.query.QueryContext.value(QueryContext.java:405)

                at org.basex.query.value.item.FuncItem.invValue(FuncItem.java:117)

                at org.basex.query.func.FuncCall.invoke(FuncCall.java:87)

                at org.basex.query.func.FuncCall.value(FuncCall.java:159)

                at org.basex.query.value.item.FItem.invokeValue(FItem.java:44)

                at org.basex.query.func.fn.FnApply.value(FnApply.java:38)

                at org.basex.query.expr.gflwor.GFLWOR.value(GFLWOR.java:72)

                at org.basex.query.QueryContext.value(QueryContext.java:405)

                at org.basex.query.value.item.FuncItem.invValue(FuncItem.java:117)

                at org.basex.query.func.FuncCall.invoke(FuncCall.java:87)

                at org.basex.query.func.FuncCall.value(FuncCall.java:159)

                at org.basex.query.value.item.FItem.invokeValue(FItem.java:44)

                at org.basex.query.func.fn.FnApply.value(FnApply.java:38)

                at org.basex.query.QueryContext.value(QueryContext.java:405)

                at org.basex.query.expr.If.value(If.java:128)

                at org.basex.query.expr.gflwor.GFLWOR.value(GFLWOR.java:72)

                at org.basex.query.QueryContext.value(QueryContext.java:405)

                at org.basex.query.value.item.FuncItem.invValue(FuncItem.java:117)

                at org.basex.query.func.FuncCall.invokeTail(FuncCall.java:123)

                at org.basex.query.func.FuncCall.value(FuncCall.java:60)

                at org.basex.query.expr.gflwor.GFLWOR.value(GFLWOR.java:72)

                at org.basex.query.QueryContext.value(QueryContext.java:405)

                at org.basex.query.value.item.FuncItem.invValue(FuncItem.java:117)

                at org.basex.query.func.FuncCall.invokeTail(FuncCall.java:123)

                at org.basex.query.func.FuncCall.value(FuncCall.java:60)

                at org.basex.query.QueryContext.value(QueryContext.java:405)

                at org.basex.query.expr.If.value(If.java:128)

                at org.basex.query.expr.gflwor.GFLWOR.value(GFLWOR.java:72)

                at org.basex.query.QueryContext.value(QueryContext.java:405)

                at org.basex.query.value.item.FuncItem.invValue(FuncItem.java:117)

                at org.basex.query.func.FuncCall.invokeTail(FuncCall.java:123)

                at org.basex.query.func.FuncCall.value(FuncCall.java:60)

                at org.basex.query.QueryContext.value(QueryContext.java:405)

                at org.basex.query.expr.If.value(If.java:128)

                at org.basex.query.expr.gflwor.GFLWOR.value(GFLWOR.java:72)

                at org.basex.query.QueryContext.value(QueryContext.java:405)

                at org.basex.query.value.item.FuncItem.invValue(FuncItem.java:117)

                at org.basex.query.func.FuncCall.invokeTail(FuncCall.java:123)

                at org.basex.query.func.FuncCall.value(FuncCall.java:60)

                at org.basex.query.expr.gflwor.GFLWOR.value(GFLWOR.java:72)

                at org.basex.query.QueryContext.value(QueryContext.java:405)

                at org.basex.query.value.item.FuncItem.invValue(FuncItem.java:117)

                at org.basex.query.func.FuncCall.invokeTail(FuncCall.java:123)

                at org.basex.query.func.FuncCall.value(FuncCall.java:60)

                at org.basex.query.QueryContext.value(QueryContext.java:405)

                at org.basex.query.expr.If.value(If.java:128)

                at org.basex.query.expr.gflwor.GFLWOR.value(GFLWOR.java:72)

                at org.basex.query.QueryContext.value(QueryContext.java:405)

                at org.basex.query.value.item.FuncItem.invValue(FuncItem.java:117)

                at org.basex.query.func.FuncCall.invokeTail(FuncCall.java:123)

                at org.basex.query.func.FuncCall.value(FuncCall.java:60)

                at org.basex.query.expr.gflwor.GFLWOR.value(GFLWOR.java:72)

                at org.basex.query.QueryContext.value(QueryContext.java:405)

                at org.basex.query.func.StaticFunc.invValue(StaticFunc.java:182)

                at org.basex.query.func.FuncCall.invoke(FuncCall.java:87)

                at org.basex.query.func.FuncCall.value(FuncCall.java:61)

                at org.basex.query.expr.TypeCheck.value(TypeCheck.java:131)

                at org.basex.query.func.Closure.item(Closure.java:288)

                at org.basex.query.func.Closure.value(Closure.java:321)

                at org.basex.query.expr.gflwor.GFLWOR.value(GFLWOR.java:72)

                at org.basex.query.expr.gflwor.GFLWOR.value(GFLWOR.java:72)

                at org.basex.query.QueryContext.value(QueryContext.java:405)

                at org.basex.query.value.item.FuncItem.invValue(FuncItem.java:117)

                at org.basex.query.func.FuncCall.invoke(FuncCall.java:87)

                at org.basex.query.func.FuncCall.value(FuncCall.java:159)

                at org.basex.query.value.item.FItem.invokeValue(FItem.java:44)

                at org.basex.query.func.fn.FnApply.value(FnApply.java:38)

                at org.basex.query.expr.gflwor.GFLWOR.value(GFLWOR.java:72)

                at org.basex.query.QueryContext.value(QueryContext.java:405)

                at org.basex.query.value.item.FuncItem.invValue(FuncItem.java:117)

                at org.basex.query.func.FuncCall.invoke(FuncCall.java:87)

                at org.basex.query.func.FuncCall.value(FuncCall.java:159)

                at org.basex.query.value.item.FItem.invokeValue(FItem.java:44)

                at org.basex.query.func.fn.FnApply.value(FnApply.java:38)

                at org.basex.query.QueryContext.value(QueryContext.java:405)

                at org.basex.query.expr.gflwor.Let$LetEval.next(Let.java:182)

                at org.basex.query.expr.gflwor.GFLWOR$1.next(GFLWOR.java:95)

                at org.basex.query.expr.ParseExpr.item(ParseExpr.java:51)

                at org.basex.query.expr.ParseExpr.value(ParseExpr.java:65)

                at org.basex.query.QueryContext.value(QueryContext.java:405)

                at org.basex.query.value.item.FuncItem.invValue(FuncItem.java:117)

                at org.basex.query.func.FuncCall.invoke(FuncCall.java:87)

                at org.basex.query.func.FuncCall.value(FuncCall.java:159)

                at org.basex.query.value.item.FItem.invokeValue(FItem.java:44)

                at org.basex.query.func.fn.FnFoldLeft.value(FnFoldLeft.java:22)

                at org.basex.query.QueryContext.value(QueryContext.java:405)

                at org.basex.query.expr.gflwor.Let$LetEval.next(Let.java:182)

                at org.basex.query.expr.gflwor.GFLWOR$1.next(GFLWOR.java:95)

                at org.basex.query.scope.MainModule$1.next(MainModule.java:121)

                at org.basex.query.QueryContext.cache(QueryContext.java:635)

                at org.basex.query.QueryProcessor.cache(QueryProcessor.java:113)

                at org.basex.core.cmd.AQuery.query(AQuery.java:86)

                at org.basex.core.cmd.XQuery.run(XQuery.java:22)

                at org.basex.core.Command.run(Command.java:257)

                at org.basex.core.Command.execute(Command.java:95)

                at org.basex.gui.GUI.exec(GUI.java:471)

                at org.basex.gui.GUI.access$3(GUI.java:425)

                at org.basex.gui.GUI$6.run(GUI.java:413)