In the error_log, this is constantly repeated:
WordPress database error Table ‘xxxxxxxxxxxxxxnz_xxxx.xxxxx_WP_SEO_Redirection’ doesn’t exist for query select * from xxxxx_WP_SEO_Redirection where enabled=1 and regex=” and this has resulted in website.co.nz/wp-admin coming up with an HTTP ERROR 500, however website.co.nz/wp-login does work, but upon logging in and trying to access the dashboard it comes up with the same HTTP ERROR 500 page