If you are getting this error “There is an error. Please Contact store administrator.” in the frontend when you are adding any product in the cart or you are getting this error in the admin end while performing any task. Then my friend you are at the right place to get the solution for it. So if the error is happening the frontend then you just have to go to Stores->Configuration->Advanced->System->Security->Max Session Size in Storefront
Put the value to be 256000 or more and save it. Clear the cache and you will see you will not get this error in the frontend. For the admin if you are logging out to often when you are doing or trying to go to a section of the admin say reviews then to fix that just go to Stores->Configuration->Advanced->System->Security->Max Session Size in Admin. Put the value to be 356000 or more. Save this value clear cache and you will see you wont this problem again.
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