Can't post tutorials without that error

[Roiarthur]

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

Tutoriaux Excalibur ​

Tutoriaux-Excalibur est un forum informatique présentant des tutoriaux, des tutoriels, trucs et astuces informatique

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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...

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