Assetic - Route "_assetic_001d5b7_0" does not exist

I had this problem just one minute ago. Clean up the cache worked for me:

app/console cache:clear --env=prod

Hope this helps.

If clearing the cache or dumping the assets doesn't work. Try noisebleed's comment:

// app/config_dev.yml
assetic:
    use_controller: true
    bundles: ['FooBarBundle']

Maybe you have removed the assetic routing from the app/routing_dev.yml

_assetic:
    resource: .
    type:     assetic