FBA Sharepoint 2013 - File not found error

I configured my SP2013 FBA environment according to a guide that i found on Visigo by Chris Coulson. Can't link since my account hasn't been verified. Have IIS8 on 1 server, the SQL(2013) installation with DB's on another one. Both are Windows 2012 Datacenter servers. Sharepoint 2013 Enterprise edition. 

Used a dummy site to store accounts. I made 2 accounts, which both get this error when logging in:

Sorry, something went wrong. File Not Found. 

Correlation ID: ee7c179c-5d45-3081-1707-77c3a0c3d213. 

After checking the web for a while I found this possible solution, which was for SP2010 though..

1. Navigate Here:
   C:\inetpub\wwroot\wss\Virtual Directories\<your web app's virtual directory>
   1. You can also open IIS
   2. Expand Sites
   3. Right click on your Sharepoint site
   4. Choose explore
   5. proceed to step 2
2. Copy and paste the web.config file (making a backup)
3. Open web.config using notepad
4. Search for “CallStack” , set this equal to true
5. Search for “Custom”, set the customerrors = “Off”
6. Search for “Debug”, set Debug = “True”
7. Save the web.config file and refresh your page in the browser

I still get the same error, problem not solved nor do i see the actual error.

Can anyone help me in what's going wrong? 

Have installed latest update patch from MS (http://support.microsoft.com/kb/2767999)

Still get the same error. 

Am using the dummy web site to store users, not using AD.