Getting RuntimeError when trying to use confirmDialog

[kiteh]

I have 2 files - main.py and utils.py.

In my utils.py, I have created a method:

def prompt_dialog(title, msg):

   res = cmds.confirmDialog(

        title=title,

       message=msg,

       button=['Yes','No'],

       defaultButton='Yes',

       cancelButton='No',

       dismissString='No'

   )
   return res

In my main.py, there are 2 methods that calls `prompt_dialog` twice but keep getting the error `RuntimeError: Only one confirmDialog may exist at a time.` whenever I did some editing towards my QLineEdit... The other method that uses `prompt_dialog` works fine with no issue.

class MyTool(MayaQWidgetDockableMixin, QtGui.QWidget):

    def __init__(self, parent=None, dockable=True):
        self.connect_signals()
        ...

    def connect_signals(self):
        self.ui.frameLineEdit.editingFinished.connect(self.frameEdited)

    def frameEdited(self):
        # Keeps getting error here
        utils.prompt_dialog("Frame Modified", "You have modified the Frame. Proceed?")

    def importRef(self):
        # No error seen
        if not cmds.objExists("|refGroup"):
            res = utils.prompt_dialog("No Ref. groups found", "Create refGroup for references import?")
            if res == "Yes":
                ...

I tried to replace the `utils.prompt_dialog` with `cmds.confirmDialog` but still, getting the same error.

Could someone shed some light?

[Justin Israel]

Do you get this same issue if you use a QMessageBox directly from Qt instead? 

Maya may be doing some internal bookkeeping on the confirmDialog instances, and because you are trigging the modal dialog in a slot callback maybe the bookkeeping hasn't cleaned up the previous confirmDialog reference by the time your slot fires again. I don't think QMessageBox would have that same issue. 

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[kiteh]

Tried with the use of QMessageBox, and it is working fine.

Initially I had thought this would work as I am calling the confirmDialog in frameEditied() (being first) and importRef() would be called on later..

Adding on, I tried to create the same prompt_dialog() in script editor, wrote 2 lines of code, each calling this method with different strings, and was given 2 confirm dialogs and hence the confusion.