Hi Linc. I Made it. When mail opens, there is no accounts there.
In order to not mix all the accounts, I've tried first to install the problematic account. The same error of duplicate account pops up.
Here I am attaching you the console lines:
8/2/15 9:23:58.828 PM com.apple.xpc.launchd[1]: (com.apple.imfoundation.IMRemoteURLConnectionAgent) The _DirtyJetsamMemoryLimit key is not available on this platform.
8/2/15 9:23:59.020 PM icbaccountsd[1067]: Connection error while checking Apple Internalness. Error: Error Domain=NSCocoaErrorDomain Code=4099 "Couldn’t communicate with a helper application." (The connection to service named com.apple.CrashReporterSupportHelper was invalidated.) UserInfo=0x7fa8ea519c10 {NSDebugDescription=The connection to service named com.apple.CrashReporterSupportHelper was invalidated.}
8/2/15 9:23:59.053 PM sandboxd[216]: ([1067]) icbaccountsd(1067) deny mach-lookup com.apple.CrashReporterSupportHelper
8/2/15 9:23:59.095 PM sandboxd[216]: ([1067]) icbaccountsd(1067) deny file-read-data /Library/Preferences/com.apple.security-common.plist
8/2/15 9:23:59.318 PM Mail[1065]: Failed to connect (view) outlet from (IASetupManager) to (NSView): missing setter or instance variable
8/2/15 9:23:59.920 PM XPCKeychainSandboxCheck[1068]: Can't get sandbox fs extension for /Library/Sophos Anti-Virus/Sophos.keychain, status=-1 errno=No such file or directory ext=(null)
8/2/15 9:24:01.392 PM accountsd[370]: Enter ShareKitAccountEnabler - didChangeWithType - type=2 for account XXXX@aveceventos.com.ar (BA459441-6491-4B1C-B2AA-F4159B1A9B9A).
8/2/15 9:24:01.393 PM accountsd[370]: AIDA Notification plugin running
8/2/15 9:24:13.342 PM sandboxd[216]: ([1071]) com.apple.WebKit(1071) deny file-read-data /Library/Preferences/com.apple.security-common.plist
8/2/15 9:24:13.924 PM sandboxd[216]: ([1072]) com.apple.WebKit(1072) deny file-read-data /Library/Preferences/com.apple.security-common.plist
8/2/15 9:24:14.414 PM com.apple.xpc.launchd[1]: (com.apple.imfoundation.IMRemoteURLConnectionAgent) The _DirtyJetsamMemoryLimit key is not available on this platform.
8/2/15 9:24:15.600 PM com.apple.xpc.launchd[1]: (com.apple.imfoundation.IMRemoteURLConnectionAgent) The _DirtyJetsamMemoryLimit key is not available on this platform.
8/2/15 9:24:59.016 PM accountsd[370]: Enter ShareKitAccountEnabler - didChangeWithType - type=1 for account XXXX@aveceventos.com.ar (B2EA5230-47DB-4549-B92C-C5ACAB3E1CC9).
8/2/15 9:24:59.016 PM accountsd[370]: AIDA Notification plugin running
8/2/15 9:24:59.322 PM com.apple.xpc.launchd[1]: (com.apple.imfoundation.IMRemoteURLConnectionAgent) The _DirtyJetsamMemoryLimit key is not available on this platform.
8/2/15 9:24:59.342 PM accountsd[370]: Enter ShareKitAccountEnabler - didChangeWithType - type=2 for account XXXX@aveceventos.com.ar (B2EA5230-47DB-4549-B92C-C5ACAB3E1CC9).
8/2/15 9:24:59.342 PM accountsd[370]: AIDA Notification plugin running
8/2/15 9:24:59.374 PM CalendarAgent[322]: -[__NSArrayM objectForKey:]: unrecognized selector sent to instance 0x7fed9e121ed0
8/2/15 9:24:59.384 PM CalendarAgent[322]: Exception fetching ABCDContact in context <ABManagedObjectContext: 0x7fed9bd67430>: keypath birthdayComponents not found in entity <NSSQLEntity ABCDContact id=21>
8/2/15 9:24:59.385 PM CalendarAgent[322]: Error fetching ABCDContact in context <ABManagedObjectContext: 0x7fed9bd67430>: (null) (null)
8/2/15 9:24:59.398 PM accountsd[370]: Enter ShareKitAccountEnabler - didChangeWithType - type=2 for account XXXX@aveceventos.com.ar (B2EA5230-47DB-4549-B92C-C5ACAB3E1CC9).
8/2/15 9:24:59.398 PM accountsd[370]: AIDA Notification plugin running
8/2/15 9:24:59.506 PM com.apple.internetaccounts[387]: AOSKit WARN: ➖ Invalid url: https://cbalmaceda%40aveceventos.com.ar@calendar.google.com/.well-known/caldav//cbalmaceda%40aveceventos.com.ar@calendar.google.com/.well-known/caldav
8/2/15 9:24:59.582 PM icbaccountsd[1067]: SOSCCThisDeviceIsInCircle SOSCCThisDeviceIsInCircle!! 7
8/2/15 9:25:00.540 PM accountsd[370]: Enter ShareKitAccountEnabler - didChangeWithType - type=2 for account XXXX@aveceventos.com.ar (B2EA5230-47DB-4549-B92C-C5ACAB3E1CC9).
8/2/15 9:25:00.540 PM accountsd[370]: AIDA Notification plugin running
8/2/15 9:25:00.583 PM icbaccountsd[1067]: SOSCCThisDeviceIsInCircle SOSCCThisDeviceIsInCircle!! 8
8/2/15 9:25:00.641 PM icbaccountsd[1067]: SOSCCThisDeviceIsInCircle SOSCCThisDeviceIsInCircle!! 9
8/2/15 9:25:00.678 PM CalendarAgent[322]: AOSKit WARN: ➖ Invalid url: https://cbalmaceda%40aveceventos.com.ar@calendar.google.com/calendar/dav/cbalmac eda%40aveceventos.com.ar/user///cbalmaceda%40aveceventos.com.ar@calendar.google.com/calendar/dav/cbalmaceda%40aveceventos.com.ar/user/
8/2/15 9:25:00.997 PM accountsd[370]: Enter ShareKitAccountEnabler - didChangeWithType - type=2 for account XXXX@aveceventos.com.ar (B2EA5230-47DB-4549-B92C-C5ACAB3E1CC9).
8/2/15 9:25:00.997 PM accountsd[370]: AIDA Notification plugin running
8/2/15 9:25:01.021 PM icbaccountsd[1067]: SOSCCThisDeviceIsInCircle SOSCCThisDeviceIsInCircle!! 10
8/2/15 9:25:01.106 PM icbaccountsd[1067]: SOSCCThisDeviceIsInCircle SOSCCThisDeviceIsInCircle!! 11
8/2/15 9:25:01.317 PM icbaccountsd[1067]: SOSCCThisDeviceIsInCircle SOSCCThisDeviceIsInCircle!! 12
8/2/15 9:25:01.819 PM CalendarAgent[322]: [com.apple.calendar.store.log.caldav.coredav] [Refusing to parse response to PROPPATCH because of content-type: [text/html; charset=UTF-8].]
8/2/15 9:25:02.013 PM CalendarAgent[322]: [com.apple.calendar.store.log.caldav.coredav] [Refusing to parse response to PROPPATCH because of content-type: [text/html; charset=UTF-8].]
8/2/15 9:25:04.512 PM com.apple.xpc.launchd[1]: (com.apple.imfoundation.IMRemoteURLConnectionAgent) The _DirtyJetsamMemoryLimit key is not available on this platform.
8/2/15 9:25:05.543 PM CoreServicesUIAgent[823]: unexpected message <OS_xpc_error: <error: 0x7fff79d8ac60> { count = 1, contents =
"XPCErrorDescription" => <string: 0x7fff79d8af70> { length = 18, contents = "Connection invalid" }
}>
8/2/15 9:25:05.545 PM com.apple.xpc.launchd[1]: (com.apple.WebKit.Networking.F955CF60-DFD0-4472-ACF0-5D9D272EA003[1071]) Service exited with abnormal code: 1