Steps to reproduce:
- Log into control panel,
- Go to Plugin Store tab and install a plugin (in my case hillholliday/craft-user-manual or dolphiq/sitemap),
- Plugin installation error screen,
- Navigate to /admin and entire site errors out with this message (control panel and frontend)
unserialize(): Error at offset 0 in ProjectConfig.php
Unsuccessful attempts to correct the issue include:
Restoring latest database backup
Restoring backed up composer.json and composer.lock files from storage/composer-backups and running
composer install
Clearing
storage/runtime/cache
Any suggestions on how to resolve this issue, and insights to why it's happening in the first place?