XF 2.2 having issue creating a page node with large content

I'm trying to create a page node with large content (24K HTML lines) but it didn't work, saving is not showing anything

what is the Max length that i can use in a page node
i just tried it in the demo and i got:
Oops! We ran into some problems. Please try again later. More error details may be in the browser console.

the console display many warnings and exceptions that i didnt understand. the live version that i have does not throw this warning for some reason.
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