Solution of Fatal error: Uncaught Error: Call to undefined function gutenberg_block_template_part() in \wp-content\themes\blockbase-wpcom\header.php:16

So I tried to test the Zoologist theme by Automattic which is using Blockbase parent theme. But while trying to install, I found the theme showing this Fatal Error

Solution

Please Install Gutenberg plugins by Gutenberg team . Click Here To Install Gutenberg Plugins and the issue will be solved