"500 Error" after upgrade

[Navigare]

We had our host upgrade PHP to 8.1 and following that updated the board to the latest stable release. The update process went fine but both the forum and ACP is now giving us "500 Errors" so help is needed - thanks!

 

[Marc]

In the first instance, please try using recovery mode to correct this. Its very likely you have items on your site in which are not currently compatible with PHP 8.1

https://invisioncommunity.com/4guides/client-services/getting-support-r292/#recoverymode