Unable to run in Sandbox

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​When I try to run my app in Sandbox it gives sais something went wrong while deploying the app. When I look at the log file at the mendi​x App Platform, this is what it gives me: Jun 1 21:43:35.017 127.0.0.1 tr10016: INFO - Core: Mendix Runtime 5.15.0 (build 4514). Copyright © 2003-2015 Mendix bv. All rights reserved. Jun 1 21:43:35.510 127.0.0.1 tr10016: INFO - XMPPConnector: appnode-confronts-tr10016@sandbox.xs4.mendixcloud.net connected. Jun 1 21:43:35.514 127.0.0.1 tr10016: INFO - XMPPConnector: Registered 'cp@beta.mendixcloud.net/Smack' as cloud portal contact Jun 1 21:43:35.534 127.0.0.1 tr10016: INFO - Logging: Logging to file: /srv/cloud/slots/tr10016/deploy/data/log/m2ee.log, max size: 2048KiB, max rotation: 10 Jun 1 21:43:37.615 127.0.0.1 tr10016: INFO - Core: Storage service: Local file system storage, uploaded files path: /srv/cloud/slots/tr10016/deploy/data/files Jun 1 21:43:37.627 127.0.0.1 tr10016: INFO - ConnectionBus: (1/2) Database: PostgreSQL 9.4.1, name: 'dbnode-confronts-db16' Jun 1 21:43:37.627 127.0.0.1 tr10016: INFO - ConnectionBus: (2/2) Driver: PostgreSQL Native Driver PostgreSQL 9.2 JDBC4 (build 1002) Jun 1 21:43:37.747 127.0.0.1 tr10016: INFO - Core: Project company name is 'Mendix' Jun 1 21:43:37.747 127.0.0.1 tr10016: INFO - Core: License expiration date is 'null' Jun 1 21:43:37.747 127.0.0.1 tr10016: INFO - Core: License type is: 'Perpetual' Jun 1 21:43:38.182 127.0.0.1 tr10016: ERROR - M2EE: Starting Mendix Runtime failed. Jun 1 21:43:38.182 127.0.0.1 tr10016: ERROR - M2EE: (1/13) com.mendix.m2ee.api.AdminException: Starting Mendix Runtime failed. Jun 1 21:43:38.182 127.0.0.1 tr10016: ERROR - M2EE: (2/13) at com.mendix.core.impl.MxRuntimeImpl.fireZeeMissile(MxRuntimeImpl.java:497) Jun 1 21:43:38.182 127.0.0.1 tr10016: ERROR - M2EE: (3/13) Jun 1 21:43:38.182 127.0.0.1 tr10016: ERROR - M2EE: (4/13) Caused by: com.mendix.core.CoreRuntimeException: com.mendix.core.CoreRuntimeException: com.mendix.systemwideinterfaces.MendixRuntimeException: Object id: 7318349394477158, validation errors: (member: Name, message: This user name is already in use.) Jun 1 21:43:38.182 127.0.0.1 tr10016: ERROR - M2EE: (5/13) at com.mendix.core.actionmanagement.ActionManager.executeInTransactionSync(ActionManager.java:177) Jun 1 21:43:38.183 127.0.0.1 tr10016: ERROR - M2EE: (6/13) Jun 1 21:43:38.183 127.0.0.1 tr10016: ERROR - M2EE: (7/13) Caused by: com.mendix.core.CoreRuntimeException: com.mendix.systemwideinterfaces.MendixRuntimeException: Object id: 7318349394477158, validation errors: (member: Name, message: This user name is already in use.) Jun 1 21:43:38.183 127.0.0.1 tr10016: ERROR - M2EE: (8/13) at com.mendix.core.actionmanagement.ActionManager.executeSync(ActionManager.java:217) Jun 1 21:43:38.183 127.0.0.1 tr10016: ERROR - M2EE: (9/13) Jun 1 21:43:38.183 127.0.0.1 tr10016: ERROR - M2EE: (10/13) Caused by: com.mendix.systemwideinterfaces.MendixRuntimeException: Object id: 7318349394477158, validation errors: (member: Name, message: This user name is already in use.) Jun 1 21:43:38.183 127.0.0.1 tr10016: ERROR - M2EE: (11/13) at com.mendix.util.classloading.Runner.doRunUsingClassLoaderOf(Runner.java:43) Jun 1 21:43:38.183 127.0.0.1 tr10016: ERROR - M2EE: (12/13) Jun 1 21:43:38.183 127.0.0.1 tr10016: ERROR - M2EE: (13/13) Caused by: com.mendix.systemwideinterfaces.core.UserException: Object id: 7318349394477158, validation errors: (member: Name, message: This user name is already in use.) Jun 1 21:43:38.189 127.0.0.1 tr10016: INFO - Core: Mendix Runtime is shutting down now... Jun 1 21:43:38.193 127.0.0.1 tr10016: INFO - Core: Mendix Runtime is now shut down. When I run the app locally, it works fine. Does anybody have an idea on how to fix this?
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1 answers
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From the error message it looks like the application can't write the user to the database because it already exists.

validation errors: (member: Name, message: This user name is already in use.)

I don't know how you would be able to solve this other than deploying to another sandbox/project or contacting support. Maybe someone else has a suggestion?

answered