So, before your customized the view it was working? The message above says that you can't use sub-views. Does your customization include any sub-views? Try resetting the UI configuration to the standard version and see if it works.
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So, before your customized the view it was working? The message above says that you can't use sub-views. Does your customization include any sub-views? Try resetting the UI configuration to the standard version and see if it works.