Hi

This error is occurred because the destination location for manufacturing product is not set. You need to set the destination location for manufacturing product, for this goto Inventory -> Settings and enable multi-step route option.

Then under the configuration menu you can see Route, check destination location for each manufacturer route

Hope it helps

Route Manufacture got a related route.  I guess the error comes from the from / to in Manufacturing Operation and MO is not set in the rules related to the Manufacturing route.

I is quite complex, but Operations, rules and routes must all "play" together. Go into route Manufacturing and check the rule you find there.