Dear Client,
I am having more than 9 years of experience as a Magento developer since 2013. I have the experience to design 50+ E-Commerce sites only in Magento.
I have understood your project. I have solved many errors regarding Magento and the server. It may be possible to happen this due to the improper migration of servers.
So I will check the server and then I will provide the total solution from this error.
Thanks,