Why do my CTE's keep failing?

I am trying to use CTE’s in a quick report, but when I try to execute the query in IFS’ Query Tool it gives me the error “Input ‘my_query’ ” did not match regular expression.

I tried with a basic CTE, that works in PL/SQL Developer:

WITH my_cte AS

(
SELECT 3+4 as result FROM DUAL
)

SELECT result from my_cte

I am not even trying to use a regular expression. Does anybody know why it does not work?

 Here is the detailed error log: 

Ifs.Fnd.FndSystemException: Explorer: An Unhandled Exception has occurred ---> System.NullReferenceException: Object reference not set to an instance of an object.
   at Ifs.Application.Fndadm.SQLQueryTool.frmDynamicSelect.ContainsAnyLOBItems(IList`1 columns)
   at Ifs.Application.Fndadm.SQLQueryTool.frmDynamicSelect.Execute(SalString sSql)
   at Ifs.Application.Fndadm.SQLQueryTool.frmDynamicSelect.UserMethod(SalNumber nWhat, SalString sMethod)
   at Ifs.Application.Fndadm.SQLQueryTool.frmDynamicSelect.vrtUserMethod(SalNumber nWhat, SalString sMethod)
   at Ifs.Fnd.ApplicationForms.cMethodManager.vrtUserMethod(SalNumber nWhat, SalString sMethod)
   at Ifs.Fnd.ApplicationForms.cMethodManager.cMethodManager_WindowActions(Object sender, WindowActionsEventArgs e)
   at PPJ.Runtime.Windows.SalWindow.InvokeWindowActions(WindowActionsEventArgs args, SalContext context, Int32 startIndex)
   at PPJ.Runtime.Windows.SalWindow.FireWindowActions(Int32 msgCode, IntPtr wParam, IntPtr lParam)
   at PPJ.Runtime.Windows.SalWindow.DispatchThenProcess(Message& m)
   at PPJ.Runtime.Windows.SalWindow.ProcessWndProc(Message& m)
   at PPJ.Runtime.Windows.SalForm.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
   --- End of inner exception stack trace ---