SideBySide Event ID 35 is logged in the Application log when you start Skype for Business on a 64-bit Windows operating system

Applies to: Skype for BusinessMicrosoft Lync 2013Windows 7 Enterprise


When you start Skype for Business (previously Microsoft Lync 2013) on a 64-bit Windows operating system, the following error is logged in the Application log:
Log Name:      Application
Source:        SideBySide
Event ID:      35
Task Category: None
Level:         Error
Keywords:      Classic
User:          N/A
Activation context generation failed for "c:\program files (x86)\microsoft office\Office15\lync.exe.Manifest".Error in manifest or policy file "c:\program files (x86)\microsoft office\Office15\UccApi.DLL" on line 1. Component identity found in manifest does not match the identity of the component requested. Reference is UccApi,processorArchitecture="AMD64",type="win32",version="". Definition is UccApi,processorArchitecture="x86",type="win32",version="". Please use sxstrace.exe for detailed diagnosis.


On 64-bit Windows operating systems, an entry in the Lync.exe application manifest incorrectly causes a request for a 64-bit version of Wlmfds.dll to be loaded into the process space. However, only a 32-bit version of Wlmfds.dll exists. Therefore, the error that is mentioned in the "Symptoms" section is reported.


You can safely ignore this error log. This error log does not cause Skype for Business to crash. The side-by-side (SxS) DLL loader will load the 32-bit version of Wlmfds.dll correctly. The event that is logged causes no functionality or stability problems with Skype for Business. 

More Information

To troubleshoot the Skype for Business crash issue, you can perform a clean boot in Windows. This helps eliminate whether the crash issue is caused by software conflicts.

A similar issue is described in the following article in the Microsoft Knowledge Base:
976229 SideBySide Event ID 35 is logged in the Application log when you start Windows Live Movie Maker on a 64-bit Windows operating system