WAC and Lync 2013 server - 'Error in /m'

I have successfully integrated Office Web App Server with my SharePoint 2013, and Exchange 2013 servers, I'm right now trying to get integration between Lync 2013 and Office Web App server going, but i'm encountering an error when trying to present powerpoint

documents.

"Some sharing features are unavailable due to server connectivity issues"

I can confirm that LS Data MCU event IT 41032 on the Lync Server, and have restarted my Lync FE server. On the WAC Server I'm noticing the following error occurs when trying to share a powerpoint:

Event code: 3008

Event message: A configuration error has occurred.

Event time: 2/7/2013 9:41:30 AM

Event time (UTC): 2/7/2013 5:41:30 PM

Event ID: 3808d0e3d8674543807c3d304f4412e5

Event sequence: 1

Event occurrence: 1

Event detail code: 0

Application information:

Application domain: /LM/W3SVC/2/ROOT/m-10-130047324907416215

Trust level: Full

Application Virtual Path: /m

Application Path: C:Program FilesMicrosoft Office Web AppsBroadcastServices_Host

Machine name: OWA

Process information:

Process ID: 1820

Process name: w3wp.exe

Account name: NT AUTHORITYNETWORK SERVICE

Exception information:

Exception type: ConfigurationErrorsException

Exception message: Could not load file or assembly 'Microsoft.Build.Utilities, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified. (C:Program FilesMicrosoft Office Web AppsBroadcastServices_Hostweb.config line 44)

at System.Web.Configuration.CompilationSection.LoadAssemblyHelper(String assemblyName, Boolean starDirective)

at System.Web.Configuration.AssemblyInfo.get_AssemblyInternal()

at System.Web.Compilation.BuildManager.GetReferencedAssemblies(CompilationSection compConfig)

at System.Web.Compilation.BuildManager.CallPreStartInitMethods(String preStartInitListPath)

at System.Web.Compilation.BuildManager.ExecutePreAppStart()

at System.Web.Hosting.HostingEnvironment.Initialize(ApplicationManager appManager, IApplicationHost appHost, IConfigMapPathFactory configMapPathFactory, HostingEnvironmentParameters hostingParameters, PolicyLevel policyLevel, Exception appDomainCreationException)

Could not load file or assembly 'Microsoft.Build.Utilities, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.

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

at System.Reflection.RuntimeAssembly.InternalLoadAssemblyName(AssemblyName assemblyRef, Evidence assemblySecurity, RuntimeAssembly reqAssembly, StackCrawlMark& stackMark, IntPtr pPrivHostBinder, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)

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

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

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

at System.Web.Configuration.CompilationSection.LoadAssemblyHelper(String assemblyName, Boolean starDirective)

Request information:

Request URL: https://office.somedomain.com:443/m/ParticipantFrame.aspx?a=0&e=true&

Request path: /m/ParticipantFrame.aspx

User host address: xx.xx.xx.xx

User:

Is authenticated: False

Authentication Type:

Thread account name: NT AUTHORITYNETWORK SERVICE

Thread information:

Thread ID: 39

Thread account name: NT AUTHORITYNETWORK SERVICE

Is impersonating: False

Stack trace: at System.Web.Configuration.CompilationSection.LoadAssemblyHelper(String assemblyName, Boolean starDirective)

at System.Web.Configuration.AssemblyInfo.get_AssemblyInternal()

at System.Web.Compilation.BuildManager.GetReferencedAssemblies(CompilationSection compConfig)

at System.Web.Compilation.BuildManager.CallPreStartInitMethods(String preStartInitListPath)

at System.Web.Compilation.BuildManager.ExecutePreAppStart()

at System.Web.Hosting.HostingEnvironment.Initialize(ApplicationManager appManager, IApplicationHost appHost, IConfigMapPathFactory configMapPathFactory, HostingEnvironmentParameters hostingParameters, PolicyLevel policyLevel, Exception appDomainCreationException)

Custom event details:

accessing the URL directly

https://office.somedomain.com:443/m/ParticipantFrame.aspx?a=0&e=true& also returns the "error in /m"

any advise?

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