Unable to build a PWA instance, every time you create a new instance it will vanish and will not log any error in the Event Viewer on the App. Server

Things to check:

Check if the user has any other Front End Server, if yes then you will see the following error in the Event Viewer on one or more of the Front End Boxes:-

Event Type: Error

Event Source: Windows SharePoint Services 3

Event Category: Timer

Event ID: 6398

Date: 3/30/2009

Time: 9:57:54 PM

User: N/A

Computer: <computername>

Description:

The Execute method of job definition Microsoft.Office.Server.Administration.JobScheduler (ID f1715e9a-2641-4d95-ac82-78c6c7e62027) threw an exception. More information is included below.

Could not load file or assembly 'Microsoft.Office.Project.Server.Administration, Version=12.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c' or one of its dependencies. The system cannot find the file specified.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

Event Type: Error

Event Source: Office SharePoint Server

Event Category: Office Server Shared Services

Event ID: 7080

Date: 3/30/2009

Time: 9:57:54 PM

User: N/A

Computer: <computername>

Description:

An exception occurred while running the job scheduler.

Reason: System.IO.FileNotFoundException: Could not load file or assembly 'Microsoft.Office.Project.Server.Administration, Version=12.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c' or one of its dependencies. The system cannot find the file specified.

File name: 'Microsoft.Office.Project.Server.Administration, Version=12.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c'

at System.Reflection.Assembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, Assembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection)

at System.Reflection.Assembly.nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, Assembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection)

at System.Reflection.Assembly.InternalLoad(AssemblyName assemblyRef, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection)

at System.Reflection.Assembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection)

at System.Reflection.Assembly.Load(String assemblyString)

at Microsoft.Office.Server.Administration.ScheduledJobCollection.CreateSqlCollectionItem(Object obj)

at Microsoft.Office.Server.Administration.ScheduledJobCollection.GetScheduledJobsInNextInterval(DateTime nextDueTime)

at Microsoft.Office.Server.Administration.JobScheduler.Execute(Guid targetInstanceId)

WRN: Assembly binding logging is turned OFF.

To enable assembly bind failure logging, set the registry value [HKLM\Software\Microsoft\Fusion!EnableLog] (DWORD) to 1.

Note: There is some performance penalty associated with assembly bind failure logging.

To turn this feature off, remove the registry value [HKLM\Software\Microsoft\Fusion!EnableLog].

<RESOLUTION>

We need to ensure that we have the Project Binaries installed on all the WFE machines in the Farm.

Please review this Blog for more information:-

http://blogs.msdn.com/brismith/archive/2006/12/28/mixed-server-farm-topologies-all-servers-must-have-all-skus-loaded.aspx