After spending some time and and almost gave up on all my Magento2 Store - I install this JUNK EXTENSION called MAGENERDS and it cause me this crash. After realizing the fact that for some reason I can't run compiler because I was getting this error Class Magenerds\PageDesigner\Model\ValidationState does not exist These are the steps I took. rm -rf /home/TEST/public_html/generated and /var/cache folder content and ran the compiler and VOILA . I was able to fix this issue. It appears that class got stuck in the memory.
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