Could you help me with this issue?

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when i want to chang Settings of TB Purity,there is An error occurred
Notice: Undefined index: region_title in nucleus_region_preview() (line 197 of E:\xampp\htdocs\test\sites\all\themes\nucleus\nucleus\inc\theme_settings_parts.inc).
Notice: Undefined index: region_title in nucleus_region_preview() (line 211 of E:\xampp\htdocs\test\sites\all\themes\nucleus\nucleus\inc\theme_settings_parts.inc).

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