How Do I Hide & Unhide Rows Based On A Defined Name For The Range?

Hello. I am trying to hide hide and unhide rows based on a named range but having issues

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Then am using the above code as a toggle on and off button that shows and hides a few rows (18:21) which i named Blood

and keep getting object does not support this property or method.

What am i doing wrong please.

Thank you. works like a charm i appreciate it