Cannot add a new episode

Hello Imdb, I'm having a hard time adding episode 6 to the 2nd season. I didn't have any trouble adding 20 episodes, but for the number 6 I keep getting this message: "Error checking updates We experienced an error while checking your updates, this may be due to the size of your submission or an issue with our systems. You can try the following options: Retry checking your updates after a few minutes Click 'Save for later' to prevent losing your work and retry submitting later. If the above doesn't work, please contact us and let us know." I have tried saving it and submitting it again - didn't work. Tried logging in through incognito mood - didn't work. Please help.