Post not saving

I have tried to save a post after entering some html code in the html editor but the post didn`t get saved, the page just loaded for about 15 seconds and then redirected me to dashboard. I have attached a text file with the html code so you can try and see.

Edit:

If I save the post with some simple text or just a couple of lines of html code it gets saved but if I try to update the post with the html code attached it won`t get saved.