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Attachment 500.log has been added with description: logs

This is not a bug since the behavior is the expected by restconf.
Restconf wont allow the user to remove the module as long as there is some dependency over it.
The first to notice is that if the RIB module used were the same as the example, there is no change applied over the already existing RIB-example. Which already is configured, where topology-examples, and services.. having it as a dependency . Therefore in case we want to remove the module, first we need to remove the modules of example topology (ipv6, ipv4, linkstate).. as any service..and then, we will be able to remove it.

Other way to test it, is to use the same example RIB module but changing the name, as soon as we put we will be able to remove it without any issue.

Correct, good catch.