web.config error - failed to load views

Microsoft (R) ASP.NET Compilation Tool version 4.0.30319.17929
Utility to precompile an ASP.NET application
Copyright (C) Microsoft Corporation. All rights reserved.

D:\temp\jfpe0bg3.ssx\output\_PublishedWebsites\Mahala.Web\web.config(25)
: error ASPCONFIG: Sections must only appear once per config file.  See
the help topic <location> for exceptions.

[ConfigurationErrorsException]: Sections must only appear once per
config file.  See the help topic <location> for exceptions.
(D:\temp\jfpe0bg3.ssx\output\_PublishedWebsites\Mahala.Web\web.config
line 25)
   at System.Configuration.SectionRecord.ThrowOnErrors()
   at
System.Configuration.BaseConfigurationRecord.GetSectionRecord(String
configKey, Boolean permitErrors)
   at
System.Configuration.BaseConfigurationRecord.GetSectionRecursive(String
configKey, Boolean getLkg, Boolean checkPermission, Boolean
getRuntimeObject, Boolean requestIsHere, Object& result, Object&
resultRuntimeObject)
   at System.Configuration.Configuration.GetSection(String sectionName)
   at
System.Web.Hosting.ApplicationManager.CreateAppDomainWithHostingEnvironm
ent(String appId, IApplicationHost appHost,
HostingEnvironmentParameters hostingParameters)   at
System.Web.HttpRuntime.HostingInit(HostingEnvironmentFlags
hostingFlags, PolicyLevel policyLevel, Exception
appDomainCreationException)

Website precompilation failed with exit code 1. Precompilation can
optionally be disabled in your AppHarbor application settings