The most common cause of this error is a misalignment between the plugin’s internal configuration and the DAW’s project settings. For instance, if a DAW project is opened with settings that restrict the number of available audio outputs, or if the plugin is trying to recall a routing setup that no longer exists (perhaps due to a changed audio interface or a corrupted preference file), the bus layouts will fail to load.
He tried the classic move: closing the DAW and restarting his computer. Nothing. He checked his VST paths , half-hoping the .dll file had just gone for a walk to a different folder. He even considered that his recent RAM upgrade had somehow de-authorized his machine, a common ghost in the machine for XLN Audio users. The Digital Repair