Opening a page (Eg: sc_category) in Service Portal and clicking on 'Instance Options' for a widget on the page, shows the below error messages.
Failing widget: 'Ticket Conversations' (85357f52cb30020000f8d856634c9c24) called from: 'Form' (fd1f4ec347730200ba13a5554ee490c0) called from: 'modal' (b89096930b211200b0b02c6317673a2c) called from: 'Widget options config' (4f8843d70b211200b0b02c6317673a7e)
Any current supported release
Old version/Customized version of Form Widget being used in which Ticket Conversations widget is not included.
Revert to the OOB version of the Form widget.