Site crash with Wappointment

please send screenshot, this error.

Thanks

Do you have a support email adress ?

no, send screenshot using lightshot software

OK

https://nimb.ws/Hm5EXD

Check your other plugin, this error not come to this plugin.

Thanks

When disabling your plugin, everything works fine. Coupon code works correctly, it only dysfunction when reactivating the plugin.

Do you think it comes from wappointment plugin ?

I am not sure but my plugin is so simple code. Please check after deactivate wappointment plugin.