score:8
Unfortunately this pretty common behavior for the Turkish Airlines website, especially since they "upgraded" it a year or two back. You can try using a different browser or using incognito mode, but odds are you'll hit the same problem again.
In general if you're getting an error like this the only option will be to contact Turkish airlines directly, or if your tickets were purchased via a travel agent (including an online travel agency) then contact the travel agency to see if they can help.
If you are unable to contact the local Turkish Airlines office, you can try calling the one in a different country - either Turkey (which is available 24x7) or somewhere like the US (+1 800 8748875, also 24x7, and available for free via services like Skype)
Upvote:2