Bind DNSSEC inline-signing loadkeys fail because zone in multiple views

I think I finally found the root cause of my problem. I have two views, that were configured to include the same master zone file twice.

You cannot use the same file for two zones. So this is invalid and caused my problem:

view "internal" {
    match-clients ...;
    zone "example.com" {
        type master;
        file "/etc/bind/zones/example.net";
    };
};
view "external" {
    match-clients ...;
    zone "example.com" {
        type master;
        file "/etc/bind/zones/example.net";
    };
};

The proper way to share a zone is described in chapter 4 of the " Understanding views in BIND 9, by example" guide. Basically, only one of the zone must be the master zone, and the other one must be a slave. After adding a few acls, keys and also-notify for localhost in the right places, I got rid of those errors.

In the end this is my final configuration:

key "internal" {
    // TSIG Key generated with dnssec-keygen -a HMAC-MD5 -b 512 -n USER internal
    algorithm hmac-md5;
    secret "XXXX";
};

view "internal" {
    match-clients { key internal; ...IPs...; }; // our network
    zone "robin.info" {
        type slave;
        file "/etc/bind/slave-zones/robin.info"; // Not the same file as external view!
        masters { 127.0.0.1; };
    };
};

view "external" {
    match-clients { !key internal; "any"; }; // everyone else
    server 127.0.0.1 {
        /* Deliver notify messages to internal view with internal key. */
        keys { internal; };
    };
    zone "robin.info" {
        type master;
        file "/etc/bind/zones/robin.info";
        // ACL file with allow-transfer and also-notify
        // including secondary DNS servers and 127.0.0.1
        include "/etc/bind/acls"; 
        key-directory "/etc/bind/dnssec/robin.info/2017";
        inline-signing yes;
        auto-dnssec maintain;
    };
};

i totaly changed my conf structure. with this KB : https://kb.isc.org/docs/aa-00851 Example 4 - Now with shared zones