Issues while building kentico solution

Regarding the Smart Search, I'd check to see if it's using a custom layout or not. If so, make sure it has the full path/namespace to the actual file in that custom layout. If it is using the default layout then you will need to debug the site a bit more to get more info from that. The event log should have more information on that.

Regarding your second error, you might want to look into the IIS event logs a bit more as they can have more details to your problem. Another solution would be to debug it locally and see where it breaks. May give you some insites as to where to start looking. If your upgrades worked without error then it could be custom code causing the problem.

Good Morning Brenden and thank you for your reply.

I've looked into the IIS event logs and I've found 2 items, I think this is due to some configuration error on my behalf but I cant quite figure out what is missing so here are the following items on the event viewer:

1 - Information:

Event code: 4005 
Event message: Forms authentication failed for the request. Reason: The ticket supplied was invalid. 
Event time: 6/8/2018 11:13:12 AM 
Event time (UTC): 6/8/2018 10:13:12 AM 
Event ID: 75f3f8236cca48e0b7d9156a7f648fc1 
Event sequence: 2 
Event occurrence: 1 
Event detail code: 50201 

Application information: 
    Application domain: /LM/W3SVC/1/ROOT/Kentico10-1-131729263846745120 
    Trust level: Full 
    Application Virtual Path: /Kentico10 
    Application Path: C:\inetpub\wwwroot\Kentico10\CMS\ 
    Machine name: FAKENAME
Process information: 
    Process ID: 1392 
    Process name: w3wp.exe 
    Account name: FAKEDOMAIN\Joao.Ferreira 

Request information: 
    Request URL: http://localhost/Kentico10 
    Request path: /Kentico10 
    User host address: ::1 
    User:  
    Is authenticated: False 
    Authentication Type:  
    Thread account name: FAKEDOMAIN\Joao.Ferreira 

Name to authenticate:  

Custom event details: 

2 - Warning:

Event code: 3005     
Event message: An unhandled exception has occurred.     
Event time: 6/8/2018 11:54:58 AM     
Event time (UTC): 6/8/2018 10:54:58 AM     
Event ID: b16d590261134c3c9b988bdb01a24b73    
Event sequence: 4     
Event occurrence: 1     
Event detail code: 0

Application information: 
        Application domain: /LM/W3SVC/1/ROOT/Kentico10-1-131729288917669454 
        Trust level: Full 
        Application Virtual Path: /Kentico10 
        Application Path: C:\inetpub\wwwroot\Kentico10\CMS\ 
        Machine name: FAKENAME 

    Process information: 
        Process ID: 9336 
        Process name: w3wp.exe 
        Account name: FAKEDOMAIN\Joao.Ferreira 

    Exception information: 
        Exception type: NullReferenceException 
        Exception message: Object reference not set to an instance of an object.
       at CMS.URLRewritingEngine.URLRewriter.RewriteUrl(String relativePath, ExcludedSystemEnum excludedEnum, SiteNameOnDemand siteName, ViewModeOnDemand viewMode)
       at CMS.URLRewritingEngine.URLRewriter.RewriteUrl(RequestStatusEnum status, String relativePath, ExcludedSystemEnum excludedEnum)
       at CMS.URLRewritingEngine.URLRewritingHandlers.RewriteUrl(Object sender, EventArgs e)
       at CMS.Base.AbstractHandler.CallEventHandler[TArgs](EventHandler'1 h, TArgs e)
       at CMS.Base.AbstractHandler.Raise[TArgs](String partName, List'1 list, TArgs e, Boolean important)
       at CMS.Base.SimpleHandler'2.RaiseExecute(TArgs e)
       at CMS.Base.SimpleHandler'2.RaiseExecute(TArgs e)
       at CMS.Base.SimpleHandler'2.StartEvent(TArgs e)
       at CMS.Base.ApplicationModule.PostResolveRequestCache(Object sender, EventArgs e)
       at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
       at System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step)
       at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)



    Request information: 
        Request URL: http://localhost/Kentico10 
        Request path: /Kentico10 
        User host address: ::1 
        User:  
        Is authenticated: False 
        Authentication Type:  
        Thread account name: FAKEDOMAIN\Joao.Ferreira 

    Thread information: 
        Thread ID: 10 
        Thread account name: FAKEDOMAIN\Joao.Ferreira 
        Is impersonating: False 
        Stack trace:    at CMS.URLRewritingEngine.URLRewriter.RewriteUrl(String relativePath, ExcludedSystemEnum excludedEnum, SiteNameOnDemand siteName, ViewModeOnDemand viewMode)
       at CMS.URLRewritingEngine.URLRewriter.RewriteUrl(RequestStatusEnum status, String relativePath, ExcludedSystemEnum excludedEnum)
       at CMS.URLRewritingEngine.URLRewritingHandlers.RewriteUrl(Object sender, EventArgs e)
       at CMS.Base.AbstractHandler.CallEventHandler[TArgs](EventHandler'1 h, TArgs e)
       at CMS.Base.AbstractHandler.Raise[TArgs](String partName, List'1 list, TArgs e, Boolean important)
       at CMS.Base.SimpleHandler'2.RaiseExecute(TArgs e)
       at CMS.Base.SimpleHandler'2.RaiseExecute(TArgs e)
       at CMS.Base.SimpleHandler'2.StartEvent(TArgs e)
       at CMS.Base.ApplicationModule.PostResolveRequestCache(Object sender, EventArgs e)
       at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
       at System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step)
       at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)


    Custom event details:

Hi, is there anyone that can help me with this?

Thanks

Have you run the site locally and debugged it? Debug it and find out where the error comes up. This will give you the ultimate way to find the issue.