Hi,
Error is trying to indicate that the user being used for publishing templates is not having a folder associated with it on Execution instance.
When you install Control instance package on the marketing instance, an external account gets created. On the execution instance, by default "mc" user is created.
You need to configure the external account on marketing instance to make use of this mc user.
Right now you are making use of admin user.
Regards,
Vipul