Any asset - vanilla or custom - modified by RICO, returns the same error as soon as you unpause the game.
Could not load type 'Problem' (System.TypeLoadException) Details: No details

This persists until you bulldoze the asset. Regular vanilla or custom assets plopped using Find It, don't return any problems. But any RICO-modified ones, do not work.

Currently using RICO Revisited Version 2.5.6. But I've tried the original RICO mod, but to no avail.

Same problem.