Migrating SS4 Site to a New Server is inducing Error Related to uninstalled Module

Questions
,
1

SS4
After migrating an SS4 site to a new server, I am getting the error below, which I believe is related to an uninstalled module, which I though I had successfully removed.

Is there a way to track down what is causing this error? Seems like it would be a configuration error of some sort.

[Unknown Error] Uncaught ReflectionException: Class SilverShop\Admin\OrdersAdmin does not 
exist

GET /admin/pages/

Line  399  in  //public_html/vendor/silverstripe/admin/code/CMSMenu.php

Thanks for any help

2

dev/build?flush=1 is your friend.

:alien::space_invader:

3

Next, I need to figure out how to solve this problem:

file-not-found

:coffee::coffee::coffee: