Unable to create new page/article

When I want to create a new page or a new article, when publishing I get the following error message :
“ERROR: MainWP Child plugin not detected. First, install and activate the plugin and add your site to your MainWP Dashboard afterward. If you continue experiencing this issue, check the child site for known plugin conflicts, or check the MainWP Community for help.”

Of course, main wp child is well installed, activated on the child website. Do you have an idea of the solution?
Thanks !

Hi @norazia, I believe that you have a ticket open for this problem. If that is correct, let’s continue there and I will post solution here once we find it.

Confirmed that the mod_security caused the problem.

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