Open Radar

 
Summary:
After updating from beta6 to beta7 of Yosemite, when I launched Mail the first time it wouldn’t open the Main message viewer.

Steps to Reproduce:
Start with a beta6 system with a mail client configured and update to beta7 and run mail.

Expected Results:
Message Viewer window should open as normal.

Actual Results:
No windows open and I cannot get any to open.

Regression:
Obviously new in beta7 of Yosemite.

Notes:

I found some errors in the log file and they are here:

03/09/14 17:29:26,804 Mail[1172]: CoreData: error: -addPersistentStoreWithType:SQLite configuration:(null) URL:file:///Users/scott/Library/Mail/V2/MailData/MessageUidsAlreadyDownloaded3 options:{
    NSPersistentStoreTimeoutOption = 15;
} ... returned error Error Domain=NSCocoaErrorDomain Code=134100 "The managed object model version used to open the persistent store is incompatible with the one that was used to create the persistent store." UserInfo=0x600000662a00 {metadata={
    NSPersistenceFrameworkVersion = 510;
    NSStoreModelVersionHashes =     {
        Account = <adc5df1f 5a6e5f11 0ba1abf3 2af4a329 728f8644 701da501 c5519da7 1e1dfc1a>;
        SeenMessage = <757e3514 690064d3 7a841a2c 4d0d75ac 1ed5b096 ee5867fd 4e4bf788 610f306a>;
    };
    NSStoreModelVersionHashesVersion = 3;
    NSStoreModelVersionIdentifiers =     (
    );
    NSStoreType = SQLite;
    NSStoreUUID = "F2EE56DF-B8CA-4B40-ACBD-EBC450EB333F";
    "_NSAutoVacuumLevel" = 2;
}, reason=The model used to open the store is incompatible with the one used to create the store} with userInfo dictionary {
    metadata =     {
        NSPersistenceFrameworkVersion = 510;
        NSStoreModelVersionHashes =         {
            Account = <adc5df1f 5a6e5f11 0ba1abf3 2af4a329 728f8644 701da501 c5519da7 1e1dfc1a>;
            SeenMessage = <757e3514 690064d3 7a841a2c 4d0d75ac 1ed5b096 ee5867fd 4e4bf788 610f306a>;
        };
        NSStoreModelVersionHashesVersion = 3;
        NSStoreModelVersionIdentifiers =         (
        );
        NSStoreType = SQLite;
        NSStoreUUID = "F2EE56DF-B8CA-4B40-ACBD-EBC450EB333F";
        "_NSAutoVacuumLevel" = 2;
    };
    reason = "The model used to open the store is incompatible with the one used to create the store";
}

03/09/14 17:29:26,842 Mail[1172]: Could not create store from /Users/scott/Library/Mail/V2/MailData/MessageUidsAlreadyDownloaded3: "The managed object model version used to open the persistent store is incompatible with the one that was used to create the persistent store.". The unreadable store has been moved to /Users/scott/Library/Mail/V2/MailData/MessageUidsAlreadyDownloaded3.corrupt and a new one will be created... success.