The Appmysite Plugin for wordpress cause my website to go down and show 404 error

I have a community website i made it with wordpress and Buddyboss, when i install the plugin, for few minutes everything is good, after that my website goes down and all the pages show 404 error except the community page.
This is my website:

Hi @esmat_akhgar,

Have you tried reaching out to any of the support channels for assistance?