Front End :
Note : theme 327k is my magento 1.9 theme
Back End :
How to solve the theme error after migrate m1 to m2
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Run below 4 QUERIES one by one in database.
DELETE FROM theme WHERE
theme_pathlike 327k in
themetable so you do not need to run first command.
After running this QUERIES in DB please run below commands once
rm -rf generated/* var/view_preprocessed/* var/page_cache/* php bin/magento setup:upgrade php bin/magento cache:clean php bin/magento cache:flush
Note : remove values from the table design_change
Hope this will help you!