While using Month and year date Picker it is throwing an error while deleting the object

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the following is the Error that getting while deleting the object.         An error occurred while executing an action of EUG_ProductOverview.ConfirmMilestoneDelete.actionButton1: EUG_ProductOverview.MovesCreationPage.monthandYearPicker3: Error while applying context Error: EUG_ProductOverview.MovesCreationPage.monthandYearPicker3: Error while applying context TypeError: Cannot use 'in' operator to search for 'unsubscribe' in null Error: An error occurred while executing an action of EUG_ProductOverview.ConfirmMilestoneDelete.actionButton1: EUG_ProductOverview.MovesCreationPage.monthandYearPicker3: Error while applying context Error: EUG_ProductOverview.MovesCreationPage.monthandYearPicker3: Error while applying context TypeError: Cannot use 'in' operator to search for 'unsubscribe' in null    at http://localhost:8080/mxclientsystem/mxui/mxui.js?638374597473608412:66:234353    at we (http://localhost:8080/mxclientsystem/mxui/mxui.js?638374597473608412:24:6501)    at r (http://localhost:8080/mxclientsystem/mxui/mxui.js?638374597473608412:24:6402)    at E (http://localhost:8080/mxclientsystem/mxui/mxui.js?638374597473608412:64:5069)
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