Now i got a different event viewer error:
What should i do now?

Error: Log Viewer is currently unavailable. DotNetNuke.Services.Exceptions.ModuleLoadException: The DELETE statement conflicted with the REFERENCE constraint "FK_ExceptionEvents_EventLog". The conflict occurred in database "DNNDB", table "dbo.ExceptionEvents", column 'LogEventID'. The statement has been terminated. ---> System.Data.SqlClient.SqlException: The DELETE statement conflicted with the REFERENCE constraint "FK_ExceptionEvents_EventLog". The conflict occurred in database "DNNDB", table "dbo.ExceptionEvents", column 'LogEventID'. The statement has been terminated. at System.Data.SqlClient.SqlConnection. (SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction) at System.Data.SqlClient.SqlInternalConnection. (SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction) at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose) at System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady) at System.Data.SqlClient.SqlCommand.RunExecuteNonQueryTds(String methodName, Boolean async, Int32 timeout, Boolean asyncWrite) at System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(TaskCompletionSource`1 completion, String methodName, Boolean sendToPipe, Int32 timeout, Boolean asyncWrite) at System.Data.SqlClient.SqlCommand.ExecuteNonQuery() at PetaPoco.Database.Execute(String sql, Object[] args) at DotNetNuke.Data.PetaPoco.PetaPocoHelper.ExecuteNonQuery(String connectionString, CommandType type, Int32 timeout, String sql, Object[] args) at DotNetNuke.Data.DataProvider.PurgeLog() at DotNetNuke.Services.Log.EventLog.DBLoggingProvider.PurgeLogBuffer() at DotNetNuke.Services.Log.EventLog.LogController.PurgeLogBuffer() at DotNetNuke.Modules.Admin.LogViewer.LogViewer. (EventArgs e) --- End of inner exception stack trace ---