XenForo Can't post tutorials without that error

[Roiarthur]

Hi, i have a problem that i cannot solve on my website

Tutoriaux Excalibur ​

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I have Xenforo v2.2.13 with Shade Of Grey style install

Since a couple of hours i cannot post any tutorials, i am having that problem

This is the tutorial that i try to post

This is the error that appears

I can post a regular post with few words but when i try to post a tutorial that error appears.

I did a...

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