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Based on the stacktrace, this happens when your user logs in, the system will try to merge the anonymous cart to the existing cart of logged in user. It looks like you assigned a shipping method id to your shipment which does not have a corresponding shipping method. Without looking into your site, I can't say anything for sure, however.
For reasons I do not understand, when I try to open Commerce Manager or my site locally, I get an error
There is no rate configured for the shipping method Mediachase.Commerce.Plugins.Shipping.WeightJurisdictionGateway, Mediachase.Commerce.Plugins.Shipping.
Full stack trace:
This error appears to me not for the first time. The last time I updated the database from old backups and it all worked, the site and Commers Manager opened. But the error appeared again. I do not understand why it arises, given the fact that I did not make any changes associated with shipping. Just at some point, everything falls and gives an error.
I am using the latest version of Episerver.