To be sure, did you turn on APEX Destruction plugin?
Destruction module has been moved to plugin and turned off by default. Everyone get this error at 4.18 upgrade if there’s any destructible mesh in content.
This was mentioned in Release Notes 
To be sure, did you turn on APEX Destruction plugin?
Destruction module has been moved to plugin and turned off by default. Everyone get this error at 4.18 upgrade if there’s any destructible mesh in content.
This was mentioned in Release Notes