AppDomain 2 (mssqlsystemresource.dbo[runtime].1) is marked for unload due to memory pressure message in SQL Server Log

From last two days I can see following in SQL Server errorlog. AppDomain 2 (mssqlsystemresource.dbo[runtime].1) unloaded. & AppDomain 2 (mssqlsystemresource.dbo[runtime].1) is marked for unload due to memory pressure. I have system environment like this : OS- microosft windows server 2012 R2 Standard processors - Intel(R) Xeon(R) CPU E5-2670 0 @2.60 GHz Installed Memory (RAM) - 8GB Hardware Information - VMWare, Inc. VMware Virtual Platform SQL Server - Microsoft SQL Server Enterprise (64-bit) I have checked out in local server for yesterday's event log . I have found thses events Server Name ID Severity Source Log Date and Time ABC 1008 Error Microsoft-Windows-Perflib Application 10/01/2015 2:21 ABC 2 Error TeamCentral Application 9/30/2015 4:20:41 PM ABC 1309 Warning ASP.NET 4.0.30319.0 Application 9/30/2015 4:20:41 PM ABC 10016 Error Microsoft-Windows-DistributedCOM System 9/30/2015 4:06:23 PM ABC 10016 Error Microsoft-Windows-DistributedCOM System 9/30/2015 4:00:04 PM ABC 10016 Error Microsoft-Windows-DistributedCOM System 9/30/2015 4:00:02 PM ABC 2 Error TeamCentral Application 9/30/2015 3:55:13 PM ABC 1309 Warning ASP.NET 4.0.30319.0 Application 9/30/2015 3:55:13 PM ABC 10016 Error Microsoft-Windows-DistributedCOM System 9/30/2015 3:40:06 PM ABC 10016 Error Microsoft-Windows-DistributedCOM System 9/30/2015 3:40:03 PM ABC 1309 Warning ASP.NET 4.0.30319.0 Application 9/30/2015 3:23:54 PM ABC 2 Error TeamCentral Application 9/30/2015 3:23:54 PM ABC 2 Error TeamCentral Application 9/30/2015 3:22:48 PM ABC 1309 Warning ASP.NET 4.0.30319.0 Application 9/30/2015 3:22:48 PM ABC 2 Error TeamCentral Application 9/30/2015 3:21:43 PM ABC 1309 Warning ASP.NET 4.0.30319.0 Application 9/30/2015 3:21:43 PM ABC 2 Error TeamCentral Application 9/30/2015 3:18:24 PM ABC 1309 Warning ASP.NET 4.0.30319.0 Application 9/30/2015 3:18:24 PM ABC 2 Error TeamCentral Application 9/30/2015 3:16:49 PM ABC 1309 Warning ASP.NET 4.0.30319.0 Application 9/30/2015 3:16:49 PM ABC 1309 Warning ASP.NET 4.0.30319.0 Application 9/30/2015 3:15:43 PM ABC 2 Error TeamCentral Application 9/30/2015 3:15:43 PM ABC 1010 Error Microsoft-Windows-Perflib Application 9/30/2015 10:42:00 AM And in Event I am getting such type of message : Event code: 3005 Event message: An unhandled exception has occurred. Event time: 9/30/2015 4:20:41 PM Event time (UTC): 9/30/2015 1:20:41 PM Event ID: 72c24cb89beb4d7f80bec250aaa686e3 Event sequence: 757 Event occurrence: 17 Event detail code: 0 Application information: Application domain: /XX/XXXX/1/ROOT/TeamCentral-2-130850431401577570 Trust level: Full Application Virtual Path: /TeamCentral Application Path: C:\XXXX\wwwroot\TeamCentral\ Machine name: ABC Process information: Process ID: 2180 Process name: w3wp.exe Account name: NT AUTHORITY\NETWORK SERVICE Exception information: Exception type: HttpException Exception message: The remote host closed the connection. The error code is 0x800704CD. at System.Web.Hosting.IIS7WorkerRequest.RaiseCommunicationError(Int32 result, Boolean throwOnDisconnect) at System.Web.Hosting.IIS7WorkerRequest.ExplicitFlush() at System.Web.HttpResponse.Flush(Boolean finalFlush, Boolean async) at System.Web.HttpWriter.WriteFromStream(Byte[] data, Int32 offset, Int32 size) at DevExpress.Web.ASPxClasses.Internal.HttpUtils.WriteFileToResponse(Page page, MemoryStream stream, String fileName, Boolean saveAsFile, String fileFormat, String contentType) at DevExpress.Web.ASPxClasses.Internal.HttpUtils.WriteFileToResponse(Page page, MemoryStream stream, String fileName, Boolean saveAsFile, String fileFormat) at DevExpress.Web.ASPxGridView.Export.ASPxGridViewExporter.WriteToResponse(String fileName, Boolean saveAsFile, String fileFormat, ExportToStream getStream, ExportOptionsBase options) at DevExpress.Web.ASPxGridView.Export.ASPxGridViewExporter.WriteXlsxToResponse(String fileName, Boolean saveAsFile) at DevExpress.Web.ASPxGridView.Export.ASPxGridViewExporter.WriteXlsxToResponse(String fileName) at InfoArch.Web.Grid.ExportHelper.Response(ExportFileType fileType, Grid structure) at InfoArch.Web.Grid.GridManager.SaveToXlsx(String filename) at System.Web.UI.WebControls.ImageButton.OnClick(ImageClickEventArgs e) at System.Web.UI.WebControls.ImageButton.RaisePostBackEvent(String eventArgument) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) Request information: Request URL: http://ABC/TeamCentral/Reporting/GridView.aspx?layoutid=38&mf=report&where=&description=PZF6Q0PKJzWQDHkN08mydZNuJ3fZ(:#cd6TgCAL0hv4u4=&screenheight=618 Request path: /TeamCentral/Reporting/GridView.aspx User host address:XXX.XXX.XX.XXX User: rafeek Is authenticated: True Authentication Type: Thread account name: NT AUTHORITY\NETWORK SERVICE Thread information: Thread ID: 190 Thread account name: NT AUTHORITY\NETWORK SERVICE Is impersonating: False Stack trace: at System.Web.Hosting.IIS7WorkerRequest.RaiseCommunicationError(Int32 result, Boolean throwOnDisconnect) at System.Web.Hosting.IIS7WorkerRequest.ExplicitFlush() at System.Web.HttpResponse.Flush(Boolean finalFlush, Boolean async) at System.Web.HttpWriter.WriteFromStream(Byte[] data, Int32 offset, Int32 size) at DevExpress.Web.ASPxClasses.Internal.HttpUtils.WriteFileToResponse(Page page, MemoryStream stream, String fileName, Boolean saveAsFile, String fileFormat, String contentType) at DevExpress.Web.ASPxClasses.Internal.HttpUtils.WriteFileToResponse(Page page, MemoryStream stream, String fileName, Boolean saveAsFile, String fileFormat) at DevExpress.Web.ASPxGridView.Export.ASPxGridViewExporter.WriteToResponse(String fileName, Boolean saveAsFile, String fileFormat, ExportToStream getStream, ExportOptionsBase options) at DevExpress.Web.ASPxGridView.Export.ASPxGridViewExporter.WriteXlsxToResponse(String fileName, Boolean saveAsFile) at DevExpress.Web.ASPxGridView.Export.ASPxGridViewExporter.WriteXlsxToResponse(String fileName) at InfoArch.Web.Grid.ExportHelper.Response(ExportFileType fileType, Grid structure) at InfoArch.Web.Grid.GridManager.SaveToXlsx(String filename) at System.Web.UI.WebControls.ImageButton.OnClick(ImageClickEventArgs e) at System.Web.UI.WebControls.ImageButton.RaisePostBackEvent(String eventArgument) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) Custom event details: I have gone through the Stackexchange before asking the question i have found out the ref https://dba.stackexchange.com/questions/63720/app-domain-is-marked-for-unload-due-to-memory-pressure but some point of view , unable to understand the event log message. Output of select @@version; > Microsoft SQL Server 2012 (SP1) - 11.0.3000.0 (X64) Oct 19 2012 > 13:38:57 Copyright (c) Microsoft Corporation Enterprise Edition > (64-bit) on Windows NT 6.2 (Build 9200: ) (Hypervisor) and output of exec sp_configure; Name minimum maximum config_value run_value max server memory (MB) 128 2147483647 2147483647 2147483647 Any suggestion would be appreciated.