This page has been modified since you opened it. You must open the page again.

After applying branding to a site workflows could not start.

Attempting to start an OOB Approval workflow got error in web browser:

Error Message:

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This Page has been modified since you opened it. You must open the page again.

Refresh page.

Correlation ID: [guid]

Date and Time: [time stamp]

ULS logs for the correlation ID:

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[Date and Time] w3wp.exe (0x12DC) 0x29D8 SharePoint Foundation General 8e1f High Failed to find the XML file at location '14\Template\Features\[feature folder]\feature.xml'  

[Date and Time] w3wp.exe (0x12DC) 0x29D8 SharePoint Foundation Feature Infrastructure fs74 Medium Feature definition missing for Feature 'feature name' (Id: 'GUID')  

[Date and Time] w3wp.exe (0x12DC) 0x29D8 SharePoint Foundation Runtime tkau Unexpected System.Web.UI.ViewStateException: Invalid viewstate. Client IP:198.160.1 Port: 2939 User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; .NET4.0C; .NET4.0E; InfoPath.3; MS-RTC EA 2) ViewState: /wEWCQKTxNo5AryysZ0GAruysZ0GApaN/GMCgY20+QMC9b+X7gcCjMXT7gMClM2Y+QoCmf228gyP9P9GzAGZMS28bkyo8CD9kfR56A== Referer: https://siteUrl/_layouts/AddWrkfl.aspx?List=1d68c04b-30d2-4fbe-9455-e125c2727b1f Path: /_layouts/DstWrkflIP.aspx

Clicking the "Refresh page" link in the web browser's error box generates another error:  

----------------------------

Error

List does not exist.

The page you selected contains a list that does not exist. It may have been deleted by another user.

Correlation ID: [guid]

Date and Time: [time stamp]

---------------------------------

ULS for the correlation:

[Date and Time] w3wp.exe (0x12DC) 0x29D8 SharePoint Foundation General 8kh7 High List does not exist. The page you selected contains a list that does not exist. It may have been deleted by another user.  

[Date and Time] w3wp.exe (0x12DC) 0x29D8 SharePoint Foundation General 8kh7 High Stack trace: onetutil.dll: (unresolved symbol, module offset=00000000000A2291)  

at 0x000007FEEFD02291 onetutil.dll: (unresolved symbol, module offset=00000000000A3451)

at 0x000007FEEFD03451 owssvr.dll: (unresolved symbol, module offset=000000000000925A)

at 0x000007FEEEE9925A owssvr.dll: (unresolved symbol, module offset=000000000003CFF4)

at 0x000007FEEEECCFF4 mscorwks.dll: (unresolved symbol, module offset=00000000002BE497)

at 0x000007FEF9B8E497 Microsoft.SharePoint.Library.ni.dll: (unresolved symbol, module offset=00000000000DB2A0)

at 0x000007FEEFB9B2A0 Microsoft.SharePoint.ni.dll: (unresolved symbol, module offset=0000000001AE0746)

at 0x000007FEF40A0746 Microsoft.SharePoint.ni.dll: (unresolved symbol, module offset=0000000001AC568F)

at 0x000007FEF408568F Microsoft.SharePoint.ni.dll: (unresolved symbol, module offset=0000000001AC4EFB)

at 0x000007FEF4084EFB Microsoft.SharePoint.ni.dll: (unresolved symbol, module offset=0000000002200127)

at 0x000007FEF47C0127 Microsoft.SharePoint.ni.dll: (unresolved symbol, module offset=0000000001FAB92C)

at 0x000007FEF456B92C System.Web.ni.dll: (unresolved symbol, module offset=00000000002759B0)

at 0x000007FEF04C59B0 System.Web.ni.dll: (unresolved symbol, module offset=000000000026671B)

at 0x000007FEF04B671B System.Web.ni.dll: (unresolved symbol, module offset=0000000000953971)

at 0x000007FEF0BA3971 System.Web.ni.dll: (unresolved symbol, module offset=00000000009443B2)

at 0x000007FEF0B943B2 System.Web.ni.dll: (unresolved symbol, module offset=0000000000925DF9)

at 0x000007FEF0B75DF9 System.Web.ni.dll: (unresolved symbol, module offset=0000000000A4DDE1)

at 0x000007FEF0C9DDE1 System.Web.ni.dll: (unresolved symbol, module offset=0000000000A4D9AB)

at 0x000007FEF0C9D9AB System.Web.ni.dll: (unresolved symbol, module offset=0000000000A4CC14)

at 0x000007FEF0C9CC14 mscorwks.dll: (unresolved symbol, module offset=00000000002BDDFA)

at 0x000007FEF9B8DDFA webengine.dll: (unresolved symbol, module offset=00000000000851C7)

at 0x000007FEE88651C7 webengine.dll: (unresolved symbol, module offset=000000000008628

[Date and Time] w3wp.exe (0x12DC) 0x29D8 SharePoint Foundation General 8e1f High Failed to find the XML file at location '14\Template\Features\[feature folder]\feature.xml'  

[Date and Time] w3wp.exe (0x12DC) 0x29D8 SharePoint Foundation Feature Infrastructure fs74 Medium Feature definition missing for Feature 'feature name' (Id: '1bf89c1b-18e3-4b9b-ad0a-6e9fc917cedd')  

[Date and Time] w3wp.exe (0x12DC) 0x29D8 SharePoint Foundation General 8nca Verbose Application error when access /_layouts/CstWrkflIP.aspx, Error=List does not exist. The page you selected contains a list that does not exist. It may have been deleted by another user.  

System.Runtime.InteropServices.COMException: List does not exist. The page you selected contains a list that does not exist. It may have been deleted by another user.

at Microsoft.SharePoint.Library.SPRequestInternalClass.GetListsWithCallback(String bstrUrl, Guid foreignWebId, String bstrListInternalName, Int32 dwBaseType, Int32 dwBaseTypeAlt, Int32 dwServerTemplate, UInt32 dwGetListFlags, UInt32 dwListFilterFlags, Boolean bPrefetchMetaData, Boolean bSecurityTrimmed, Boolean bGetSecurityData, Boolean bPrefetchRelatedFields, ISP2DSafeArrayWriter p2DWriter, Int32& plRecycleBinCount)  

at Microsoft.SharePoint.Library.SPRequest.GetListsWithCallback(String bstrUrl, Guid foreignWebId, String bstrListInternalName, Int32 dwBaseType, Int32 dwBaseTypeAlt, Int32 dwServerTemplate, UInt32 dwGetListFlags, UInt32 dwListFilterFlags, Boolean bPrefetchMetaData, Boolean bSecurityTrimmed, Boolean bGetSecurityData, Boolean bPrefetchRelatedFields, ISP2DSafeArrayWriter p2DWriter, Int32& plRecycleBinCount)  

[Date and Time] w3wp.exe (0x12DC) 0x29D8 SharePoint Foundation Runtime tkau Unexpected System.Runtime.InteropServices.COMException: List does not exist. The page you selected contains a list that does not exist. It may have been deleted by another user.  

at Microsoft.SharePoint.Library.SPRequestInternalClass.GetListsWithCallback(String bstrUrl, Guid foreignWebId, String bstrListInternalName, Int32 dwBaseType, Int32 dwBaseTypeAlt, Int32 dwServerTemplate, UInt32 dwGetListFlags, UInt32 dwListFilterFlags, Boolean bPrefetchMetaData, Boolean bSecurityTrimmed, Boolean bGetSecurityData, Boolean bPrefetchRelatedFields, ISP2DSafeArrayWriter p2DWriter, Int32& plRecycleBinCount)  

at Microsoft.SharePoint.Library.SPRequest.GetListsWithCallback(String bstrUrl, Guid foreignWebId, String bstrListInternalName, Int32 dwBaseType, Int32 dwBaseTypeAlt, Int32 dwServerTemplate, UInt32 dwGetListFlags, UInt32 dwListFilterFlags, Boolean bPrefetchMetaData, Boolean bSecurityTrimmed, Boolean bGetSecurityData, Boolean bPrefetchRelatedFields, ISP2DSafeArrayWriter p2DWriter, Int32& plRecycleBinCount)

We are also getting an error browsing to "Site Actions > Site Settings > Workflows which had same errors as the ULS log errors when starting a workflow:  

Error Message:

------------------

Failed to find the XML file at location '14\Template\Features\[feature folder]\feature.xml'  

Correlation ID: [guid]

Date and Time: [time stamp]

This site also experienced issues with creating / adding columns to lists / libraries.

Cause:

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The custom master page included customizations and code in the area of the search box. 

Resolution:

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Adjust the custom master page so that it was no longer able to add branding to the search box.

Please let me know in case of any queries/questions regarding the above mentioned information, Thank you.