email does not start

System.ApplicationException: database disk image is malformed
database disk image is malformed
Line: 9
DELETE FROM mail_index.MailItems WHERE NOT EXISTS(SELECT id FROM mail_data.LocalMailContents WHERE id=mail_index.MailItems.id LIMIT 1);
   em MailClient.Storage.Data.DbRepository1.ImportFromResource(IDbConnection connection, Stream myStream, CancellationToken token)    em MailClient.Storage.Data.DbRepository1.ImportFromManifestResource(String resourceName, CancellationToken token)
   em MailClient.Storage.Data.DbRepository1.Repair(RepairMode mode, CancellationToken token) &nbsp; &nbsp;em MailClient.Accounts.ItemRepositories.Repair(RepairMode mode, CancellationToken token) &nbsp; &nbsp;em DbRepair.ConsistencyChecker.CheckConsistencyForAccount(String accountDirectory, RepairMode mode, CancellationToken token) &nbsp; &nbsp;em DbRepair.ConsistencyChecker.\<\>c\_\_DisplayClass2\_0.<check>b__0(String p)<br> em DbRepair.PerAccountExecutor.Execute(String dataStoreLocation, Func2 action)
em DbRepair.ConsistencyChecker.Check(RepairMode mode, CancellationToken token)
em DbRepair.CheckingProcess.Check(CancellationToken token)
Data:
ResourceName: MailClient.Storage.Mail.Data.DbMailRepository.consistency.sql
DatastoreLocation: C:\Users\anderson\AppData\Roaming\eM Client</check>

This error indicates that your database is heavily corrupted. Do you have a backup of your database folder? If you have a backup of eM Client’s database you can simply replace it and eM Client should start working without any problems.