Magento 2.3.3 - How to solve Unable to load theme by specified key

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1

Front End :

frond-end
frond-end.jpg1364×683 156 KB

Note : theme 327k is my magento 1.9 theme

Back End :

back-end
back-end.png1366×691 145 KB

How to solve the theme error after migrate m1 to m2