Fix magento 2.2.8 backend error

Hi, I have read your requirements, I will definitely help you in configurations and setting up the Project as per your requirements. If you can give opportunity then I will do this job for you. Have a look at my expertise/skills. I have web-development experience in PHP, wordpress, corePHP, HTML, HTML5, CSS, CSS3, BOOOTSTRAP3, RESPONSIVE WEBSITES, PARRALLAX WEBSITES I have versatile experience in setting-up and managing various servers, optimizations and troubleshooting them for the best usage and fine tuning the security aspects. I have experience in cloud hosting like AWS, Azure ,Digital ocean Linode and google hosting. I have expertise in migrating website or applications from one server to another with the lowest possible downtime.I have set up and maintained clusters of DNS server, web servers using Apache / Nginx controlled by a load balancer, Database server configurations and migrations of MySQL, PostgreSQL, Mongo DB, etc. I am always interested in new projects and look forward to discussing how we can work together. I can provide industry reference if needed. Thanks